Merge branch '2.8' into 3.4

* 2.8:
  fix the command output

Author: javiereguiluz

service_container.rst

@@ -62,22 +62,22 @@ What other services are available? Find out by running:
     $ php bin/console debug:container
 
     # this is just a *small* sample of the output...
-    =============================== =======================================================================
+    =============================== ==================================================================
     Service ID                      Class name
-    =============================== =======================================================================
-    doctrine                        ``Doctrine\Bundle\DoctrineBundle\Registry``
-    filesystem                      ``Symfony\Component\Filesystem\Filesystem``
-    form.factory                    ``Symfony\Component\Form\FormFactory``
-    logger                          ``Symfony\Bridge\Monolog\Logger``
-    request_stack                   ``Symfony\Component\HttpFoundation\RequestStack``
-    router                          ``Symfony\Bundle\FrameworkBundle\Routing\Router``
-    security.authorization_checker  ``Symfony\Component\Security\Core\Authorization\AuthorizationChecker``
-    security.password_encoder       ``Symfony\Component\Security\Core\Encoder\UserPasswordEncoder``
-    session                         ``Symfony\Component\HttpFoundation\Session\Session``
-    translator                      ``Symfony\Component\Translation\DataCollectorTranslator``
-    twig                            ``Twig\Environment``
-    validator                       ``Symfony\Component\Validator\Validator\ValidatorInterface``
-    =============================== =======================================================================
+    =============================== ==================================================================
+    doctrine                        Doctrine\Bundle\DoctrineBundle\Registry
+    filesystem                      Symfony\Component\Filesystem\Filesystem
+    form.factory                    Symfony\Component\Form\FormFactory
+    logger                          Symfony\Bridge\Monolog\Logger
+    request_stack                   Symfony\Component\HttpFoundation\RequestStack
+    router                          Symfony\Bundle\FrameworkBundle\Routing\Router
+    security.authorization_checker  Symfony\Component\Security\Core\Authorization\AuthorizationChecker
+    security.password_encoder       Symfony\Component\Security\Core\Encoder\UserPasswordEncoder
+    session                         Symfony\Component\HttpFoundation\Session\Session
+    translator                      Symfony\Component\Translation\DataCollectorTranslator
+    twig                            Twig\Environment
+    validator                       Symfony\Component\Validator\Validator\ValidatorInterface
+    =============================== ==================================================================
 
 You can also use the unique "Service ID" to access a service directly::