the_architecture: Fix syntax error

Author: kainjow

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'))) {