fix(uart): changes log message to a more clear one

Author: SuGlider

Diff for: cores/esp32/esp32-hal-uart.c

@@ -1389,7 +1389,7 @@ int uart_send_msg_with_break(uint8_t uartNum, uint8_t *msg, size_t msgSize) {
 // returns the maximum valid uart RX Timeout based on the UART Source Clock and Baudrate
 uint16_t uart_get_max_rx_timeout(uint8_t uartNum) {
   if (uartNum >= SOC_UART_NUM) {
-    log_e("UART%d does not exist. This device has %d UARTs, from 0 to %d.", uartNum, SOC_UART_NUM, SOC_UART_NUM - 1);
+    log_e("UART%d is invalid. This device has %d UARTs, from 0 to %d.", uartNum, SOC_UART_NUM, SOC_UART_NUM - 1);
     return (uint16_t) -1;
   }
   uint16_t tout_max_thresh = uart_ll_max_tout_thrd(UART_LL_GET_HW(uartNum));