remove trailing spaces, add missing use statement

Author: tacman

components/console/single_command_tool.rst

@@ -8,12 +8,13 @@ it is possible to remove this need by declaring a single command application::
     #!/usr/bin/env php
     <?php // bin/file-counter.php
     require __DIR__.'/../vendor/autoload.php';
-    
+
     use Symfony\Component\Console\Input\InputArgument;
     use Symfony\Component\Console\Input\InputInterface;
+    use Symfony\Component\Console\Input\InputOption;
     use Symfony\Component\Console\Output\OutputInterface;
     use Symfony\Component\Console\SingleCommandApplication;
-    
+
     (new SingleCommandApplication())
         ->setName('File Counter') // Optional
         ->setVersion('1.0.0') // Optional
@@ -34,9 +35,9 @@ it is possible to remove this need by declaring a single command application::
         })
         ->run();
 
-Now run it with 
+Now run it with
 
-    php bin/file-counter.php 
+    php bin/file-counter.php
 
     php bin/file-counter.php --all