doc(guide:$location): fix example for two way databinding.

gnomeontherun · petebacondarwin · commit a7ba27b92c43 · 2013-05-17T19:16:55.000+01:00
When you are watching the $location.path(), it has to be wrapped in a
function since it is not attached to the scope and if you pass a string
to $scope.$watch it is evaluated against the $scope.
diff --git a/docs/content/guide/dev_guide.services.$location.ngdoc b/docs/content/guide/dev_guide.services.$location.ngdoc
@@ -619,21 +619,25 @@ to the $location object (using {@link api/ng.directive:input.text
 ngModel} directive on an input field), you will need to specify an extra model property
 (e.g. `locationPath`) with two watchers which push $location updates in both directions. For
 example:
-<pre>
-<!-- html -->
-<input type="text" ng-model="locationPath" />
-</pre>
-<pre>
-// js - controller
-$scope.$watch('locationPath', function(path) {
-  $location.path(path);
-});
-
-$scope.$watch('$location.path()', function(path) {
-  scope.locationPath = path;
-});
-</pre>
-
+<example>
+<file name="index.html">
+<div ng-controller="LocationController">
+  <input type="text" ng-model="locationPath" />
+</div>
+</file>
+<file name="script.js">
+function LocationController($scope, $location) {
+  $scope.$watch('locationPath', function(path) {
+    $location.path(path);
+  });
+  $scope.$watch(function() {
+    return $location.path();
+  }, function(path) {
+    $scope.locationPath = path;
+  });
+}
+</file>
+</example>
 
 # Related API
 
