posix: kconfig: remove select y from non-user-selectable help

Several help prompts for non-user-selectable Kconfig options
included the phrase "select 'y' here", which does not make
any sense in this situation.

Adjust the help sections to use more appropriate language.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

lib/posix/options/Kconfig.device_io

@@ -27,27 +27,27 @@ if POSIX_DEVICE_IO
 config POSIX_DEVICE_IO_ALIAS_CLOSE
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for close() as _close().
+	  When selected via Kconfig, Zephyr will provide an alias for close() as _close().
 
 config POSIX_DEVICE_IO_ALIAS_OPEN
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for open() as _open().
+	  When selected via Kconfig, Zephyr will provide an alias for open() as _open().
 
 config POSIX_DEVICE_IO_ALIAS_READ
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for read() as _read().
+	  When selected via Kconfig, Zephyr will provide an alias for read() as _read().
 
 config POSIX_DEVICE_IO_ALIAS_WRITE
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for write() as _write().
+	  When selected via Kconfig, Zephyr will provide an alias for write() as _write().
 
 config POSIX_DEVICE_IO_STDIN_STDOUT_STDERR
 	bool
 	help
-	  Select 'y' here and Zephyr will provide the stdin, stdout, and stderr variables.
+	  When selected via Kconfig, Zephyr will provide the stdin, stdout, and stderr variables.
 
 	  Some libc's that implement the POSIX API may already have declared these variables.
 	  However, it should be noted that they are a part of POSIX and not a part of ISO C.

lib/posix/options/Kconfig.fd_mgmt

@@ -21,16 +21,16 @@ if POSIX_FD_MGMT
 config POSIX_FD_MGMT_ALIAS_FCNTL
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for fcntl() as _fcntl().
+	  When selected via Kconfig, Zephyr will provide an alias for fcntl() as _fcntl().
 
 config POSIX_FD_MGMT_ALIAS_FTRUNCATE
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for ftruncate() as _ftruncate().
+	  When selected via Kconfig, Zephyr will provide an alias for ftruncate() as _ftruncate().
 
 config POSIX_FD_MGMT_ALIAS_LSEEK
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for lseek() as _lseek().
+	  When selected via Kconfig, Zephyr will provide an alias for lseek() as _lseek().
 
 endif # POSIX_FD_MGMT

lib/posix/options/Kconfig.fs

@@ -15,6 +15,6 @@ if POSIX_FILE_SYSTEM
 config POSIX_FILE_SYSTEM_ALIAS_FSTAT
 	bool
 	help
-	  Select 'y' here and Zephyr will provide an alias for fstat() as _fstat().
+	  When selected via Kconfig, Zephyr will provide an alias for fstat() as _fstat().
 
 endif # POSIX_FILE_SYSTEM