doc: release: 3.5: add posix api release notes

Add release notes with  POSIX API updates for v3.5.0.

(cherry picked from commit 086dd2e)

Original-Signed-off-by: Christopher Friedt <cfriedt@meta.com>
GitOrigin-RevId: 086dd2e
Change-Id: Iab84f811ecc1886105642aed912ad770a24c4f54
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/4921897
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Tested-by: Keith Short <keithshort@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>
Commit-Queue: Keith Short <keithshort@chromium.org>

doc/releases/release-notes-3.5.rst

@@ -476,6 +476,25 @@ Libraries / Subsystems
 
  * Added the :ref:`binary_descriptors` (``bindesc``) subsystem.
 
+* POSIX API
+
+ * Added dynamic thread stack support for :c:func:`pthread_create`
+ * Fixed :c:func:`stat` so that it returns file stats instead of filesystem stats
+ * Implemented :c:func:`pthread_barrierattr_destroy`, :c:func:`pthread_barrierattr_getpshared`,
+ :c:func:`pthread_barrierattr_init`, :c:func:`pthread_barrierattr_setpshared`,
+ :c:func:`pthread_condattr_destroy`, :c:func:`pthread_condattr_init`,
+ :c:func:`pthread_mutexattr_destroy`, :c:func:`pthread_mutexattr_init`, :c:func:`uname`,
+ :c:func:`sigaddset`, :c:func:`sigdelset`, :c:func:`sigemptyset`, :c:func:`sigfillset`,
+ :c:func:`sigismember`, :c:func:`strsignal`, :c:func:`pthread_spin_destroy`,
+ :c:func:`pthread_spin_init`, :c:func:`pthread_spin_lock`, :c:func:`pthread_spin_trylock`,
+ :c:func:`pthread_spin_unlock`, :c:func:`timer_getoverrun`, :c:func:`pthread_condattr_getclock`,
+ :c:func:`pthread_condattr_setclock`, :c:func:`clock_nanosleep`
+ * Added support for querying the number of bytes available to read via the
+ :c:macro:`FIONREAD` request to :c:func:`ioctl`
+ * Added :kconfig:option:`CONFIG_FDTABLE` to conditionally compile file descriptor table
+ * Added logging to POSIX threads, mutexes, and condition variables
+ * Fixed :c:func:`poll` issue with event file descriptors
+
 HALs
 ****