AngularJS: Fixed completed count (close #478)

architecture-examples/angularjs/index.html

@@ -46,7 +46,7 @@
 						<a ng-class="{selected: location.path() == '/completed'}" href="#/completed">Completed</a>
 					</li>
 				</ul>
-				<button id="clear-completed" ng-click="clearCompletedTodos()" ng-show="completedCount">Clear completed ({{doneCount}})</button>
+				<button id="clear-completed" ng-click="clearCompletedTodos()" ng-show="completedCount">Clear completed ({{completedCount}})</button>
 			</footer>
 		</section>
 		<footer id="info">