bug #5417 Add use statement for InputDefinition (harikt)

This PR was submitted for the 2.6 branch but it was merged into the 2.3 branch instead (closes #5417).

Discussion
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Add use statement for InputDefinition

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| License       | MIT

I think I send to the right branch.

Thank you

Commits
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733c607 Add use statement for InputDefinition

Author: wouterj

components/console/console_arguments.rst

@@ -14,6 +14,7 @@ Have a look at the following command that has three options::
 
     use Symfony\Component\Console\Command\Command;
     use Symfony\Component\Console\Input\InputArgument;
+    use Symfony\Component\Console\Input\InputDefinition;
     use Symfony\Component\Console\Input\InputInterface;
     use Symfony\Component\Console\Input\InputOption;
     use Symfony\Component\Console\Output\OutputInterface;