boards: doc: Update H3ULCB documentation
boards: doc: Update H3ULCB documentation

Update documentation for H3ULCB board following the
addition of new features during v2.6 windows.

Signed-off-by: Aymeric Aillet <50ecb97e8539231bfe69207a233bb1580c5def34@iot.bzh>

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