revise the explain of a parameter(brk_len) in uart driver file
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@ -594,8 +594,7 @@ int uart_write_bytes(uart_port_t uart_num, const char* src, size_t size);
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* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
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* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
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* @param src data buffer address
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* @param src data buffer address
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* @param size data length to send
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* @param size data length to send
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* @param brk_len break signal length (unit: the time it takes to send a complete byte
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* @param brk_len break signal duration(unit: the time it takes to send one bit at current baudrate)
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including start, stop and parity bits at current_baudrate)
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*
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*
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* @return
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* @return
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* - (-1) Parameter error
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* - (-1) Parameter error
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