boards: arm: nucleo_f303re: doc: Fix board type typo.
boards: arm: nucleo_f303re: doc: Fix board type typo.

The current board's documentation includes a board type typo.
Change the board type to the proper one.

Signed-off-by: Jan Kuliga <ce5003e3901258e8edf4fbec3f5202410d52911a@gmail.com>

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