samples: hello_world: use zephyr:code-sample directive

Adds missing code-sample directive to the Hello World sample in
preparation for upcoming changes to the Zephyr documentation that will
be leveraging the provided description and metadata.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

boards/96boards/aerocore2/doc/index.rst

@@ -311,7 +311,7 @@ You should see following confirmation on your Linux host:
    usb 1-2.1: SerialNumber: 3574364C3034
 
 Then build and flash an application. Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/argonkey/doc/index.rst

@@ -145,7 +145,7 @@ Programming and Debugging
 Building
 ========
 
-Here is an example for building the :ref:`hello_world` application.
+Here is an example for building the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/carbon/doc/stm32f401xe.rst

@@ -299,7 +299,7 @@ You should see following confirmation on your Linux host:
    usb 1-2.1: SerialNumber: 3574364C3034
 
 Then build and flash an application. Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/neonkey/doc/index.rst

@@ -135,7 +135,7 @@ Programming and Debugging
 Building
 ========
 
-Here is an example for building the :ref:`hello_world` application.
+Here is an example for building the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/nitrogen/doc/index.rst

@@ -273,7 +273,7 @@ and install a more recent version of pyOCD.
 Flashing an Application to 96Boards Nitrogen
 ============================================
 
-Here is an example for the :ref:`hello_world` application. This
+Here is an example for the :zephyr:code-sample:`hello_world` application. This
 requires installing the :ref:`pyocd-debug-host-tools`.
 
 .. zephyr-app-commands::
@@ -302,7 +302,7 @@ Debugging with GDB
 ==================
 
 You can debug an application in the usual way.  Here is an example for the
-:ref:`hello_world` application. This also requires pyOCD.
+:zephyr:code-sample:`hello_world` application. This also requires pyOCD.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/stm32_sensor_mez/doc/index.rst

@@ -181,7 +181,7 @@ Programming and Debugging
 Building
 ========
 
-Here is an example for building the :ref:`hello_world` application.
+Here is an example for building the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -198,7 +198,7 @@ included in the Zephyr SDK.
 Flashing an application to 96Boards STM32 Sensor Mezzanine
 ----------------------------------------------------------
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 Run a serial host program to connect with your 96Boards STM32 Sensor Mezzanine
 board.
@@ -224,7 +224,7 @@ Debugging
 =========
 
 You can debug an application in the usual way.  Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/96boards/wistrio/doc/96b_wistrio.rst

@@ -148,7 +148,7 @@ More detailed information on activating the ROM bootloader can be found in
 Chapter 29 of Application note `AN2606`_. The ROM bootloader supports flashing
 via UART, and I2C protocols.
 
-Here is an example for building and flashing the :ref:`hello_world` application using `stm32flash`_ command line utility:
+Here is an example for building and flashing the :zephyr:code-sample:`hello_world` application using `stm32flash`_ command line utility:
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/adafruit/feather_m0_basic_proto/doc/index.rst

@@ -110,7 +110,7 @@ the reset button twice.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adafruit/feather_m0_lora/doc/index.rst

@@ -119,7 +119,7 @@ the reset button twice.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adafruit/grand_central_m4_express/doc/index.rst

@@ -111,7 +111,7 @@ The bootloader can be entered by quickly tapping the reset button twice.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adafruit/itsybitsy_m4_express/doc/index.rst

@@ -122,7 +122,7 @@ will be entered automatically when you run :code:`west flash`.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adafruit/nrf52_adafruit_feather/doc/index.rst

@@ -118,10 +118,10 @@ found in :ref:`nordic_segger_flashing`. Then build and flash
 applications as usual (see :ref:`build_an_application` and
 :ref:`application_run` for more details).
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adafruit/trinket_m0/doc/index.rst

@@ -114,7 +114,7 @@ will be entered automatically when you run :code:`west flash`.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/adi/eval_adin1110ebz/doc/index.rst

@@ -145,7 +145,7 @@ program to connect with your ADI board. For example:
    $ minicom -D /dev/serial/by-id/usb-ADI_EVAL-ADIN1110EBZ_AVAS_XXXXXX-if00-port0
 
 where XXXXXX is the serial number of the connected device.
-Then, build and flash in the usual way. Here is an example for the :ref:`hello_world` application.
+Then, build and flash in the usual way. Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -161,7 +161,7 @@ You should see the following message on the console:
 Debugging
 =========
 
-You can debug an application in the usual way.  Here is an example for the :ref:`hello_world`
+You can debug an application in the usual way.  Here is an example for the :zephyr:code-sample:`hello_world`
 application.
 
 .. zephyr-app-commands::

boards/adi/eval_adin2111ebz/doc/index.rst

@@ -146,7 +146,7 @@ program to connect with your ADI board. For example:
    $ minicom -D /dev/serial/by-id/usb-ADI_EVAL-ADIN2111EBZ_XXXXXX-12-if00-port0
 
 where XXXXXX is the serial number of the connected device.
-Then, build and flash in the usual way. Here is an example for the :ref:`hello_world` application.
+Then, build and flash in the usual way. Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -162,7 +162,7 @@ You should see the following message on the console:
 Debugging
 =========
 
-You can debug an application in the usual way.  Here is an example for the :ref:`hello_world`
+You can debug an application in the usual way.  Here is an example for the :zephyr:code-sample:`hello_world`
 application.
 
 .. zephyr-app-commands::

boards/adi/max32690fthr/doc/index.rst

@@ -98,7 +98,7 @@ Logic levels are fixed to VDDIO (1.8V).
 
 Once the debug probe is connected to your host computer, then you can run the
 ``west flash`` command to write a firmware image into flash. Here is an example
-for the :ref:`hello_world` application.
+for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -118,7 +118,7 @@ Debugging
 
 Once the debug probe is connected to your host computer, then you can run the
 ``west debug`` command to write a firmware image into flash and start a debug
-session. Here is an example for the :ref:`hello_world` application.
+session. Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/adi/sdp_k1/doc/index.rst

@@ -151,7 +151,7 @@ Run a serial host program to connect with your board:
 
    $ minicom -D /dev/serial/by-id/usb-ARM_DAPLink_CMSIS-DAP_<...>
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/alientek/pandora_stm32l475/doc/index.rst

@@ -182,7 +182,7 @@ board. For example:
    $ minicom -D /dev/ttyACM0
 
 Then, build and flash in the usual way. Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -199,7 +199,7 @@ Debugging
 =========
 
 You can debug an application in the usual way.  Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/altr/max10/doc/index.rst

@@ -147,7 +147,7 @@ Flashing Kernel into UFM
 ------------------------
 
 The usual ``flash`` target will work with the ``altera_max10`` board
-configuration. Here is an example for the :ref:`hello_world`
+configuration. Here is an example for the :zephyr:code-sample:`hello_world`
 application.
 
 .. zephyr-app-commands::

boards/ambiq/apollo3_evb/doc/index.rst

@@ -60,7 +60,7 @@ Flashing an application
 -----------------------
 
 Connect your device to your host computer using the JLINK USB port.
-The sample application :ref:`hello_world` is used for this example.
+The sample application :zephyr:code-sample:`hello_world` is used for this example.
 Build the Zephyr kernel and application, then flash it to the device:
 
 .. zephyr-app-commands::

boards/ambiq/apollo3p_evb/doc/index.rst

@@ -60,7 +60,7 @@ Flashing an application
 -----------------------
 
 Connect your device to your host computer using the JLINK USB port.
-The sample application :ref:`hello_world` is used for this example.
+The sample application :zephyr:code-sample:`hello_world` is used for this example.
 Build the Zephyr kernel and application, then flash it to the device:
 
 .. zephyr-app-commands::

boards/ambiq/apollo4p_blue_kxr_evb/doc/index.rst

@@ -68,7 +68,7 @@ Flashing an application
 -----------------------
 
 Connect your device to your host computer using the JLINK USB port.
-The sample application :ref:`hello_world` is used for this example.
+The sample application :zephyr:code-sample:`hello_world` is used for this example.
 Build the Zephyr kernel and application, then flash it to the device:
 
 .. zephyr-app-commands::

boards/ambiq/apollo4p_evb/doc/index.rst

@@ -63,7 +63,7 @@ Flashing an application
 -----------------------
 
 Connect your device to your host computer using the JLINK USB port.
-The sample application :ref:`hello_world` is used for this example.
+The sample application :zephyr:code-sample:`hello_world` is used for this example.
 Build the Zephyr kernel and application, then flash it to the device:
 
 .. zephyr-app-commands::

boards/andestech/adp_xc7k_ae350/doc/index.rst

@@ -226,7 +226,7 @@ Building
 ========
 
 You can build applications in the usual way. Here is an example for
-the :ref:`hello_world` application.
+the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arduino/due/doc/index.rst

@@ -175,7 +175,7 @@ Applications for the ``arduino_due`` board configuration can be built
 and flashed in the usual way (see :ref:`build_an_application` and
 :ref:`application_run` for more details).
 
-Here is an example for the :ref:`hello_world` application. After
+Here is an example for the :zephyr:code-sample:`hello_world` application. After
 building the application, press the Reset button before running the
 flash command, so the board will boot into the SAM-BA bootloader and
 be prepared to receive the new program.

boards/arduino/giga_r1/doc/index.rst

@@ -130,7 +130,7 @@ First, connect the Arduino GIGA R1 board to your host computer using the USB
 port to prepare it for flashing. Double click the ``RST`` button to put the
 board into the Arduino Bootloader mode. Then build and flash your application.
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arduino/mkrzero/doc/index.rst

@@ -130,7 +130,7 @@ bootloader can be entered by quickly tapping the reset button twice.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/arduino/nano_33_iot/doc/index.rst

@@ -118,7 +118,7 @@ will be entered automatically when you run :code:`west flash`.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/arduino/nicla_sense_me/doc/index.rst

@@ -95,7 +95,7 @@ Flashing
 First, connect the Arduino Nicla Sense ME board to your host computer using
 the USB port to prepare it for flashing. Then build and flash your application.
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world
@@ -118,7 +118,7 @@ Debugging
 =========
 
 You can debug an application in the usual way.  Here is an example for the
-:ref:`hello_world` application.
+:zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arduino/nicla_vision/doc/index.rst

@@ -137,7 +137,7 @@ First, connect the Arduino Nicla Vision board to your host computer using the US
 port to prepare it for flashing. Double click the ``RST`` button to put the
 board into the Arduino Bootloader mode. Then build and flash your application.
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arduino/portenta_h7/doc/index.rst

@@ -114,7 +114,7 @@ First, connect the Arduino Portenta H7 board to your host computer using
 the USB port to prepare it for flashing. Double tap the button to put the board
 into the Arduino Bootloader mode. Then build and flash your application.
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arduino/zero/doc/index.rst

@@ -118,7 +118,7 @@ OpenOCD.
 Flashing
 ========
 
-#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
+#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
 
    .. zephyr-app-commands::
       :zephyr-app: samples/hello_world

boards/arm/mps2/doc/mps2_an385.rst

@@ -253,7 +253,7 @@ V2M MPS2 provides:
 Flashing an application to V2M MPS2
 -----------------------------------
 
-Here is an example for the :ref:`hello_world` application.
+Here is an example for the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arm/mps2/doc/mps2_an521.rst

@@ -489,7 +489,7 @@ MPS2+ AN521 provides:
 - A Serial Port which is J10 on MPS2+ board
 
 Build applications as described above.
-Here is an example for the :ref:`hello_world` application built as
+Here is an example for the :zephyr:code-sample:`hello_world` application built as
 a secure-only application for CPU0.
 
 .. zephyr-app-commands::

boards/arm/mps3/doc/index.rst

@@ -142,7 +142,7 @@ Building an application
 -----------------------
 
 You can build applications in the usual way. Here is an example for
-the :ref:`hello_world` application.
+the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world

boards/arm/v2m_beetle/doc/index.rst

@@ -229,7 +229,7 @@ Flashing an application to V2M Beetle
 -------------------------------------
 
 You can build applications in the usual way. Here is an example for
-the :ref:`hello_world` application.
+the :zephyr:code-sample:`hello_world` application.
 
 .. zephyr-app-commands::
    :zephyr-app: samples/hello_world