Update index.html

Little typo in example code of ui-calendar

Author: Lutz Epperlein

index.html

@@ -364,7 +364,7 @@ <h4>Click to add an Event!</h4>
 				</div>
 				<h3>How?</h3>
 				<pre class="prettyprint linenums">
-&lt;div ui-calendar="{height: 450,editable: true}" class="span8 calendar" ng-model="events"&gt;&lt;/div&gt; 
+&lt;div ui-calendar="{height: 450,editable: true}" class="span8 calendar" ng-model="eventSources"&gt;&lt;/div&gt; 
 
 function CalendarCtrl($scope) {
     var date = new Date();