docs(limitTo): update example to use a module

src/ng/filter/limitTo.js

@@ -19,17 +19,18 @@
  *     had less than `limit` elements.
  *
  * @example
-   <example>
+   <example module="limitToExample">
      <file name="index.html">
        <script>
-         function Ctrl($scope) {
-           $scope.numbers = [1,2,3,4,5,6,7,8,9];
-           $scope.letters = "abcdefghi";
-           $scope.numLimit = 3;
-           $scope.letterLimit = 3;
-         }
+         angular.module('limitToExample', [])
+           .controller('ExampleController', ['$scope', function($scope) {
+             $scope.numbers = [1,2,3,4,5,6,7,8,9];
+             $scope.letters = "abcdefghi";
+             $scope.numLimit = 3;
+             $scope.letterLimit = 3;
+           }]);
        </script>
-       <div ng-controller="Ctrl">
+       <div ng-controller="ExampleController">
          Limit {{numbers}} to: <input type="integer" ng-model="numLimit">
          <p>Output numbers: {{ numbers | limitTo:numLimit }}</p>
          Limit {{letters}} to: <input type="integer" ng-model="letterLimit">