boards: arm: olimex_lora_stm32wl_devkit: fix typo

The board embeds a Bosch BME280 temperature, humidity, pressure
sensor[1].

[1]: https://www.olimex.com/Products/IoT/LoRa/LoRa-STM32WL-DevKit/open-source-hardware



Signed-off-by: Gaël PORTAY <gael.portay@gmail.com>