fix(rmt): fixes the example to wait for rmt TX

libraries/ESP32/examples/RMT/RMT_LED_Blink/RMT_LED_Blink.ino

@@ -281,19 +281,22 @@ void RMT_Repeated_Write_Blink() {
   Serial.println("Using RMT Writing repeated N times to blink an LED.");
   Serial.println("Blinking at 1s on + 1s off :: 2 blinks");
   // repeating blink_1s_rmt_data (1s on + 1s off) 2 times for 2 blinks
-  if (!rmtWriteRepeated(BLINK_GPIO, blink_1s_rmt_data, RMT_SYMBOLS_OF(blink_1s_rmt_data) - 1, 2)) {
+  if (!rmtWriteRepeated(BLINK_GPIO, blink_1s_rmt_data, RMT_SYMBOLS_OF(blink_1s_rmt_data), 2)) {
     Serial.println("===> rmtWrite Blink 1s Error!");
   }
+  delay(4000 + 1000); // it should blink 2 times and stop automatically
   Serial.println("Blinking at 500ms on + 500ms off :: 4 blinks");
   // repeating blink_500ms_rmt_data (500ms on + 500ms off) 4 times for 4 blinks
-  if (!rmtWriteRepeated(BLINK_GPIO, blink_500ms_rmt_data, RMT_SYMBOLS_OF(blink_500ms_rmt_data) - 1, 4)) {
+  if (!rmtWriteRepeated(BLINK_GPIO, blink_500ms_rmt_data, RMT_SYMBOLS_OF(blink_500ms_rmt_data), 4)) {
     Serial.println("===> rmtWrite Blink 0.5s Error!");
   }
+  delay(4000 + 1000); // it should blink 4 times and stop automatically
   Serial.println("Blinking at 250ms on + 250ms off :: 8 blinks");
   // repeating blink_250ms_rmt_data (250ms on + 250ms off) 8 times for 8 blinks
-  if (!rmtWriteRepeated(BLINK_GPIO, blink_250ms_rmt_data, RMT_SYMBOLS_OF(blink_250ms_rmt_data) - 1, 8)) {
+  if (!rmtWriteRepeated(BLINK_GPIO, blink_250ms_rmt_data, RMT_SYMBOLS_OF(blink_250ms_rmt_data), 8)) {
     Serial.println("===> rmtWrite Blink 0.25s Error!");
   }
+  delay(4000 + 1000); // it should blink 8 times and stop automatically
   Serial.println("Blinking is OFF for 2 seconds");
   delay(2000);
 }