Increase delay between publishes and fix a typo

Author: M65649

examples/mqtt_polling/mqtt_polling.ino

@@ -69,7 +69,7 @@ void loop() {
     String message = MqttClient.readMessage(MQTT_SUB_TOPIC);
 
     // Read message will return an empty string if there were no new
-    // messages, so anything other than that means that there were a new
+    // messages, so anything other than that means that there was a new
     // message
     if (message != "") {
         Log.infof("Got new message: %s\r\n", message.c_str());
@@ -87,5 +87,5 @@ void loop() {
         Log.error("Failed to publish");
     }
 
-    delay(1000);
+    delay(5000);
 }