release: Added v3.2 release notes for the Raspberry Pi Pico
release: Added v3.2 release notes for the Raspberry Pi Pico

Added changes made to the rpi_pico board RP2040 SoC to the release
notes.

Signed-off-by: Yonatan Schachter <c03ea33f3e5919b7d64cfd097e68ce03a1b1a328@gmail.com>

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