STM32F3: UART: Adjusted example to include a Uart instance
STM32F3: UART: Adjusted example to include a Uart instance

chrism333/xpcc,chrism333/xpcc,dergraaf/xpcc,dergraaf/xpcc,dergraaf/xpcc,dergraaf/xpcc,chrism333/xpcc,chrism333/xpcc