docs(orderBy): add example of directly calling $filter('orderBy')

It's not a bad example of sorting fields in a table, which is something people are frequently wanting
to do. So I say, LGTM!
                        ~caitp, 1988-2014

Closes #7602

Author: zainengineer

src/ng/filter/orderBy.js

@@ -61,6 +61,51 @@
        </div>
      </file>
    </example>
+ *
+ * It's also possible to call the orderBy filter manually, by injecting `$filter`, retrieving the
+ * filter routine with `$filter('orderBy')`, and calling the returned filter routine with the
+ * desired parameters.
+ *
+ * Example:
+ *
+ * @example
+  <example>
+    <file name="index.html">
+      <div ng-controller="Ctrl">
+        <table class="friend">
+          <tr>
+            <th><a href="" ng-click="reverse=false;order('name', false)">Name</a>
+              (<a href="" ng-click="order('-name',false)">^</a>)</th>
+            <th><a href="" ng-click="reverse=!reverse;order('phone', reverse)">Phone Number</a></th>
+            <th><a href="" ng-click="reverse=!reverse;order('age',reverse)">Age</a></th>
+          </tr>
+          <tr ng-repeat="friend in friends">
+            <td>{{friend.name}}</td>
+            <td>{{friend.phone}}</td>
+            <td>{{friend.age}}</td>
+          </tr>
+        </table>
+      </div>
+    </file>
+
+    <file name="script.js">
+      function Ctrl($scope, $filter) {
+        var orderBy = $filter('orderBy');
+        $scope.friends = [
+          { name: 'John',    phone: '555-1212',    age: 10 },
+          { name: 'Mary',    phone: '555-9876',    age: 19 },
+          { name: 'Mike',    phone: '555-4321',    age: 21 },
+          { name: 'Adam',    phone: '555-5678',    age: 35 },
+          { name: 'Julie',   phone: '555-8765',    age: 29 }
+        ];
+
+        $scope.order = function(predicate, reverse) {
+          $scope.friends = orderBy($scope.friends, predicate, reverse);
+        };
+        $scope.order('-age',false);
+      }
+    </file>
+</example>
  */
 orderByFilter.$inject = ['$parse'];
 function orderByFilter($parse){