demo(datepicker): fix tag name in an example

Author: pkozlowski-opensource

src/datepicker/docs/demo.html

@@ -2,7 +2,7 @@
     <pre>Selected date is: <em>{{dt | date:'fullDate' }}</em></pre>
 
     <div class="well well-small pull-left" ng-model="dt">
-        <datepicker min="minDate" show-weeks="showWeeks"></datepciker>
+        <datepicker min="minDate" show-weeks="showWeeks"></datepicker>
     </div>
 
     <div class="form-horizontal">