bluetooth: Fix bt_buf_get_rx() documentation
bluetooth: Fix bt_buf_get_rx() documentation

Edit the 'type' parameter description that describes the
allowed input values in order to match the implementation

Signed-off-by: Ahmed Moheb <959392136cc845507c486a78b4e206e971c1e699@nordicsemi.no>

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