minor symfony#9570 fix indentation (xabbuh)

This PR was merged into the 4.0 branch.

Discussion
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fix indentation

This fixes symfony#9564.

Commits
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5e33d78 fix indentation

Author: xabbuh

service_container/configurators.rst

@@ -184,16 +184,16 @@ all the classes are already loaded as services. All you need to do is specify th
         $container->getDefinition(GreetingCardManager::class)
             ->setConfigurator(array(new Reference(EmailConfigurator::class), 'configure'));
 
-    The traditional configurator syntax in YAML files used an array to define
-    the service id and the method name:
+The traditional configurator syntax in YAML files used an array to define
+the service id and the method name:
 
-    .. code-block:: yaml
+.. code-block:: yaml
 
-        app.newsletter_manager:
-            # new syntax
-            configurator: 'App\Mail\EmailConfigurator:configure'
-            # old syntax
-            configurator: ['@App\Mail\EmailConfigurator', configure]
+    app.newsletter_manager:
+        # new syntax
+        configurator: 'App\Mail\EmailConfigurator:configure'
+        # old syntax
+        configurator: ['@App\Mail\EmailConfigurator', configure]
 
 That's it! When requesting the ``App\Mail\NewsletterManager`` or
 ``App\Mail\GreetingCardManager`` service, the created instance will first be