Add a link to the MQTT wiki page

webv4/components/mqtt.xjs

@@ -106,6 +106,10 @@
                                 </div>
                             </div>
                         </form>
+
+                        <div class="alert alert-warning">
+                            If you're not sure what to put here, take a look at the <a href="https://wiki.synchro.net/howto:mqtt#websockets" target="_blank">MQTT Wiki Entry</a>.
+                        </div>
                     </div>
                     <div class="panel-footer">
                         <p>