Updated main example in docs

docs/index.html

@@ -162,16 +162,23 @@ var timeline = new vis.Timeline(container, data, options);
 <div id="visualization"></div>
 
 <script type="text/javascript">
+  // DOM element where the Timeline will be attached
   var container = document.getElementById('visualization');
-  var data = [
+
+  // Create a DataSet (allows two way data-binding)
+  var data = new vis.DataSet([
     {id: 1, content: 'item 1', start: '2013-04-20'},
     {id: 2, content: 'item 2', start: '2013-04-14'},
     {id: 3, content: 'item 3', start: '2013-04-18'},
     {id: 4, content: 'item 4', start: '2013-04-16', end: '2013-04-19'},
     {id: 5, content: 'item 5', start: '2013-04-25'},
     {id: 6, content: 'item 6', start: '2013-04-27'}
-  ];
+  ]);
+
+    // Configuration for the Timeline
   var options = {};
+
+  // Create a Timeline
   var timeline = new vis.Timeline(container, data, options);
 </script>
 </body>