minor #11305 [DX] Added line feed to container alias description (text descriptor) (Maxime Douailin)

This PR was merged into the 2.6-dev branch.

Discussion
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[DX] Added line feed to container alias description (text descriptor)

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

This PR just adds a line feed at the end of the alias service description delivered by the ContainerDebugCommand. Tests are passing because expected outputs are trimmed before comparison (which IMO is not a really good thing, but hey...)

Commits
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13c011c Added line feed to container alias description (text descriptor)

src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php

@@ -273,7 +273,7 @@ class TextDescriptor extends Descriptor
      */
     protected function describeContainerAlias(Alias $alias, array $options = array())
     {
-        $this->writeText(sprintf('This service is an alias for the service <info>%s</info>', (string) $alias), $options);
+        $this->writeText(sprintf("This service is an alias for the service <info>%s</info>\n", (string) $alias), $options);
     }
 
     /**