feat(uart): add commentaties

Author: SuGlider

cores/esp32/esp32-hal-uart.h

@@ -65,6 +65,7 @@ uint32_t uartGetBaudRate(uart_t *uart);
 // invMask can be UART_SIGNAL_RXD_INV, UART_SIGNAL_TXD_INV, UART_SIGNAL_RTS_INV, UART_SIGNAL_CTS_INV
 // returns the operation success status
 bool uartPinSignalInversion(uart_t *uart, uint32_t invMask, bool inverted);
+// functions used to individually enable or disable UART pins inversion
 bool uartSetRxInvert(uart_t *uart, bool invert);
 bool uartSetTxInvert(uart_t *uart, bool invert);
 bool uartSetCtsInvert(uart_t *uart, bool invert);