Improve docs II

Author: AB-xdev

vaadin-maps-leaflet-flow-demo/src/main/java/software/xdev/vaadin/maps/leaflet/flow/demo/EventDemo.java

@@ -51,6 +51,10 @@ public EventDemo()
 
 		final HorizontalLayout hlButtons = new HorizontalLayout();
 
+		// !!! NOTE !!!
+		// A more complex demo which also sends data back from the client to the server
+		// can be found in ComplexDemo#addEventDemo
+		
 		// Bind clickFunc to map so that it gets disposed when the map is disposed
 		final String clickFuncReference = map.clientComponentJsAccessor() + ".myCoolClickFunc";
 		reg.execJs(clickFuncReference + "=e => alert('You clicked: ' + e.latlng)");