devices: fix typo in STM32MP1

Update the word 'Board' to correct spelling.

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Suggested-by: Santeri Paavolainen <santtu@iki.fi>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

building/devices/stm32mp1.rst

@@ -11,7 +11,7 @@ Supported boards
 ****************
 
 +---------------------+--------------------+------------+-------------------------------+
-| Baord Name          | Manufacturer       | Boot media | Hardware Description          |
+| Board Name          | Manufacturer       | Boot media | Hardware Description          |
 +=====================+====================+============+===============================+
 | `STM32MP157A-DK1`_  | STMicroelectronics | SDcard     | `Wiki STM32MP157X-DKX`_       |
 +---------------------+--------------------+------------+-------------------------------+