minor symfony#9127 Update grammar mistake (zrashwani)

This PR was submitted for the 3.4 branch but it was merged into the 3.3 branch instead (closes symfony#9127).

Discussion
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Update grammar mistake

Commits
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d6e09c6 Update grammar mistake

Author: javiereguiluz

controller/service.rst

@@ -88,7 +88,7 @@ Alternatives to base Controller Methods
 When using a controller defined as a service, you can still extend any of the
 :ref:`normal base controller <the-base-controller-class-services>` classes and
 use their shortcuts. But, you don't need to! You can choose to extend *nothing*,
-and use dependency injection to access difference services.
+and use dependency injection to access different services.
 
 The base `Controller class source code`_ is a great way to see how to accomplish
 common tasks. For example, ``$this->render()`` is usually used to render a Twig