Updated comment

ampel-firmware/co2_sensor.cpp

@@ -133,7 +133,7 @@ namespace sensor {
     }
     /**
      * Display data, even if it's "old" (with breathing).
-     * A short delay is required in order to not overwhelm controller.
+     * A short delay is required in order to let background tasks run on the ESP8266.
      * see https://github.com/esp8266/Arduino/issues/3241#issuecomment-301290392
      */
     if (co2 < 2000) {