minor symfony#15980 Updated the styles of the config parameters (javiereguiluz)

This PR was squashed before being merged into the 2.8 branch (closes symfony#15980).

Discussion
----------

Updated the styles of the config parameters

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This PR uses comment() which hasn't been merged yet. WIP PR at symfony#15964

**I have a question**: is it mandatory that the output of this command is a valid YAML or XML file? If not, we can keep the changes in the title of the command. Otherwise, I'll revert those changes.

![config_1](https://cloud.githubusercontent.com/assets/73419/10144197/9018a138-661c-11e5-8c9d-dc1b721533b8.png)

![config_2](https://cloud.githubusercontent.com/assets/73419/10144199/925e5604-661c-11e5-8597-8e01013c2e86.png)

Commits
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fdaa513 Updated the styles of the config parameters

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php

@@ -13,7 +13,6 @@
 
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Console\Helper\Table;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\StyleInterface;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 
@@ -26,7 +25,7 @@
  */
 abstract class AbstractConfigCommand extends ContainerDebugCommand
 {
-    protected function listBundles(OutputInterface $output)
+    protected function listBundles($output)
     {
         $headers = array('Bundle name', 'Extension alias');
         $rows = array();
@@ -35,12 +34,10 @@ protected function listBundles(OutputInterface $output)
             $rows[] = array($bundle->getName(), $extension ? $extension->getAlias() : '');
         }
 
-        $message = 'Available registered bundles with their extension alias if available:';
         if ($output instanceof StyleInterface) {
-            $output->writeln(' '.$message);
             $output->table($headers, $rows);
         } else {
-            $output->writeln($message);
+            $output->writeln('Available registered bundles with their extension alias if available:');
             $table = new Table($output);
             $table->setHeaders($headers)->setRows($rows)->render($output);
         }

src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php

@@ -66,6 +66,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $name = $input->getArgument('name');
 
         if (empty($name)) {
+            $output->comment('Provide the name of a bundle as the first argument of this command to dump its configuration.');
+            $output->newLine();
             $this->listBundles($output);
 
             return;
@@ -85,9 +87,9 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $config = $processor->processConfiguration($configuration, $configs);
 
         if ($name === $extension->getAlias()) {
-            $output->writeln(sprintf('# Current configuration for extension with alias: "%s"', $name));
+            $output->title(sprintf('Current configuration for extension with alias "%s"', $name));
         } else {
-            $output->writeln(sprintf('# Current configuration for "%s"', $name));
+            $output->title(sprintf('Current configuration for "%s"', $name));
         }
 
         $output->writeln(Yaml::dump(array($extension->getAlias() => $config), 3));

src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php

@@ -71,6 +71,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $name = $input->getArgument('name');
 
         if (empty($name)) {
+            $output->comment('Provide the name of a bundle as the first argument of this command to dump its default configuration.');
+            $output->newLine();
             $this->listBundles($output);
 
             return;