docs(demo): fix incorrect ui-select-match

Closes #1757 
Related #1685

Author: Jefiozie

docs/examples/demo-select2-with-bootstrap.html

@@ -24,7 +24,7 @@
         <div class="col-sm-6">
 
           <ui-select multiple sortable="true" ng-model="ctrl.person.selected" theme="select2" class="form-control" title="Choose a person">
-            <ui-select-match placeholder="Select or search a person in the list...">{{$select.selected.name}}</ui-select-match>
+            <ui-select-match placeholder="Select or search a person in the list...">{{$item.name}}</ui-select-match>
             <ui-select-choices repeat="item in ctrl.people | filter: $select.search">
               <div ng-bind-html="item.name | highlight: $select.search"></div>
               <small ng-bind-html="item.email | highlight: $select.search"></small>