docs(guide/controller): only show best practice controller creation

If it is not recommended to use a global function to create controllers,
why should it be shown as possible in the documentation?

One of the most common complaints about AngularJS is that it doesn't enforce
any convention. This is intentional and I generally like this.
However if we can avoid outright bad implementations in examples I believe
we should.

Closes #8011

Author: cranesandcaff

docs/content/guide/controller.ngdoc

@@ -37,15 +37,22 @@ The properties contain the **view model** (the model that will be presented by t
 `$scope` properties will be available to the template at the point in the DOM where the Controller
 is registered.
 
-The following example shows a very simple constructor function for a Controller, `GreetingController`,
+The following example demonstrates setting up
+`GreetingController`,
 which attaches a `greeting` property containing the string `'Hola!'` to the `$scope`:
 
+We attach the controller as a module on the application using the `.controller` method of your
+{@link module Angular Module}. This keeps it out of the global scope.
+
 ```js
-function GreetingController($scope) {
+var myApp = angular.module('myApp',[]);
+
+myApp.controller('GreetingController', ['$scope', function($scope) {
   $scope.greeting = 'Hola!';
-}
+}]);
 ```
 
+
 Once the Controller has been attached to the DOM, the `greeting` property can be data-bound to the
 template:
 
@@ -55,17 +62,7 @@ template:
 </div>
 ```
 
-**NOTE**: Although Angular allows you to create Controller functions in the global scope, this is
-not recommended.  In a real application you should use the `.controller` method of your
-{@link module Angular Module} for your application as follows:
-
-```js
-var myApp = angular.module('myApp',[]);
 
-myApp.controller('GreetingController', ['$scope', function($scope) {
-  $scope.greeting = 'Hola!';
-}]);
-```
 
 We have used an **inline injection annotation** to explicitly specify the dependency
 of the Controller on the `$scope` service provided by Angular. See the guide on
@@ -333,6 +330,3 @@ describe('state', function() {
     });
 });
 ```
-
-
-