[docs] Improve halconf/mcuconf code examples (#24597)
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@ -35,8 +35,12 @@ You'll need to determine which pins can be used for UART -- as an example, STM32
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To enable UART, modify your board's `mcuconf.h` to enable the peripheral you've chosen, for example:
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```c
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#undef STM32_SERIAL_USE_USART2
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#define STM32_SERIAL_USE_USART2 TRUE
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#pragma once
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#include_next <mcuconf.h>
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#undef STM32_SERIAL_USE_USART2 // [!code focus]
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#define STM32_SERIAL_USE_USART2 TRUE // [!code focus]
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```
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Configuration-wise, you'll need to set up the peripheral as per your MCU's datasheet -- the defaults match the pins for a Proton-C, i.e. STM32F303.
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