SetDefaultCommand first arg is command name

Author: mickaelandrieu

components/console/single_command_tool.rst

@@ -41,21 +41,17 @@ Of course, you can still register a command as usual::
   require __DIR__.'/vendor/autoload.php';
 
   use Symfony\Component\Console\Application;
-  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 Acme\Command\DefaultCommand;
-  
+
   $application = new Application('echo', '1.0.0');
   $command = new DefaultCommand();
-  
+
   $application->add($command);
-  
-  $application->setDefaultCommand($command, true); 
+
+  $application->setDefaultCommand($command->getName(), true); 
   $application->run();
-  
+
 .. tip::
 
     You don't need to pass the command name in order to get the help.