[MQTT] Renamed examples

examples/MQTT_Publish/MQTT_Publish.ino

@@ -1,5 +1,5 @@
 /*
-   KiteLib ESP8266 MQTT Publish Example
+   KiteLib MQTT Publish Example
 
    This example publishes MQTT messages using ESP8266 WiFi module.
 

examples/MQTT_Subscribe/MQTT_Subscribe.ino

@@ -1,5 +1,5 @@
 /*
-   KiteLib ESP8266 MQTT Subscribe Example
+   KiteLib MQTT Subscribe Example
 
    This example subscribes to MQTT topic using ESP8266 WiFi module.