doc: release-notes: add notes for LoRa, LoRaWAN and LED
doc: release-notes: add notes for LoRa, LoRaWAN and LED

Add release notes for LoRa, LoRaWAN and LED, got these from Manivannan
on Discord.

Signed-off-by: Fabio Baltieri <1c55e39c05d9ab42261288cf330256b2af6ba179@google.com>
Co-authored-by: Manivannan Sadhasivam <7cdffa2a61f6c51ff0ae24b4793b8c7f31d1b1b0@linaro.org>

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