Debug UART typo & clarification
Top.s: HAL_UARTStartUp takes 0's based UART numbers, so the debug setup would go wrong (if HAL_UARTStartUp actually checked the value). UART.s: Re-express the baud register default value so its origin is clear. Retagged as BCM2835-0_75 as the (non-debug) version is binary identical.
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