Add use statement for InputDefinition

Author: harikt

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;