bug #4771 [QuickTour] use the debug:router command name (xabbuh)

This PR was merged into the 2.6 branch.

Discussion
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[QuickTour] use the debug:router command name

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | 2.6+
| Fixed tickets |

Commits
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b0d7cb6 use the debug:router command name

Author: wouterj

quick_tour/the_architecture.rst

@@ -287,7 +287,7 @@ The ``--help`` option helps you discover the usage of a command:
 
 .. code-block:: bash
 
-    $ php app/console router:debug --help
+    $ php app/console debug:router --help
 
 Final Thoughts
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