minor #5624 the_architecture: Fix syntax error (kainjow)

This PR was submitted for the 2.7 branch but it was merged into the 2.3 branch instead (closes #5624).

Discussion
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the_architecture: Fix syntax error

Commits
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edcdb3a the_architecture: Fix syntax error

Author: wouterj

quick_tour/the_architecture.rst

@@ -114,7 +114,7 @@ a single Bundle class that describes it::
             new Symfony\Bundle\DoctrineBundle\DoctrineBundle(),
             new Symfony\Bundle\AsseticBundle\AsseticBundle(),
             new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
-            new AppBundle\AppBundle();
+            new AppBundle\AppBundle(),
         );
 
         if (in_array($this->getEnvironment(), array('dev', 'test'))) {