[#5648] Added two missing use statements

Author: wouterj

components/console/helpers/questionhelper.rst

@@ -25,6 +25,8 @@ Suppose you want to confirm an action before actually executing it. Add
 the following to your command::
 
     // ...
+    use Symfony\Component\Console\Input\InputInterface;
+    use Symfony\Component\Console\Output\OutputInterface;
     use Symfony\Component\Console\Question\ConfirmationQuestion;
 
     class YourCommand extends Command