doc: release-notes: Add C library release notes for 3.2
doc: release-notes: Add C library release notes for 3.2

This commit adds the C library release notes for the Zephyr 3.2
release.

Signed-off-by: Stephanos Ioannidis <d862a8ba07ce1656f326514118a4618b42d2d2c0@nordicsemi.no>

galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr