minor #13143 Update routing.rst (DurandSacha)

This PR was submitted for the master branch but it was squashed and merged into the 4.4 branch instead.

Discussion
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Update routing.rst

add some uses statements ( InputInterface & OutputInterface )

Commits
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1703a2f Update routing.rst

Author: OskarStark

routing.rst

@@ -1971,6 +1971,9 @@ This information can be configured per command too::
     // src/Command/SomeCommand.php
     namespace App\Command;
 
+    use Symfony\Component\Console\Command\Command;
+    use Symfony\Component\Console\Input\InputInterface;
+    use Symfony\Component\Console\Output\OutputInterface;
     use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
     use Symfony\Component\Routing\RouterInterface;
     // ...