docs(guide/controller): remove duplicate -Controller suffix

Closes #8482

Author: cexbrayat

docs/content/guide/controller.ngdoc

@@ -158,7 +158,7 @@ Things to notice in the example above:
 - The `ng-controller` directive is used to (implicitly) create a scope for our template, and the
 scope is augmented (managed) by the `SpicyController` Controller.
 - `SpicyController` is just a plain JavaScript function. As an (optional) naming convention the name
-starts with capital letter and ends with "Controller" or "Controller".
+starts with capital letter and ends with "Controller".
 - Assigning a property to `$scope` creates or updates the model.
 - Controller methods can be created through direct assignment to scope (see the `chiliSpicy` method)
 - The Controller methods and properties are available in the template (for the `<div>` element and