minor #4881 Remove 'acme' (ifdattic)

This PR was squashed before being merged into the 2.3 branch (closes #4881).

Discussion
----------

Remove 'acme'

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Commits
-------

f76ff18 Remove 'acme'

cookbook/form/dynamic_form_modification.rst

@@ -246,7 +246,7 @@ Using an event listener, your form might look like this::
 
         public function getName()
         {
-            return 'acme_friend_message';
+            return 'friend_message';
         }
 
         public function setDefaultOptions(OptionsResolverInterface $resolver)
@@ -389,29 +389,29 @@ it with :ref:`dic-tags-form-type`.
 
         # app/config/config.yml
         services:
-            acme.form.friend_message:
+            app.form.friend_message:
                 class: AppBundle\Form\Type\FriendMessageFormType
                 arguments: ["@security.context"]
                 tags:
-                    - { name: form.type, alias: acme_friend_message }
+                    - { name: form.type, alias: friend_message }
 
     .. code-block:: xml
 
         <!-- app/config/config.xml -->
         <services>
-            <service id="acme.form.friend_message" class="AppBundle\Form\Type\FriendMessageFormType">
+            <service id="app.form.friend_message" class="AppBundle\Form\Type\FriendMessageFormType">
                 <argument type="service" id="security.context" />
-                <tag name="form.type" alias="acme_friend_message" />
+                <tag name="form.type" alias="friend_message" />
             </service>
         </services>
 
     .. code-block:: php
 
         // app/config/config.php
         $definition = new Definition('AppBundle\Form\Type\FriendMessageFormType');
-        $definition->addTag('form.type', array('alias' => 'acme_friend_message'));
+        $definition->addTag('form.type', array('alias' => 'friend_message'));
         $container->setDefinition(
-            'acme.form.friend_message',
+            'app.form.friend_message',
             $definition,
             array('security.context')
         );
@@ -425,22 +425,22 @@ access to the form factory, you then use::
     {
         public function newAction(Request $request)
         {
-            $form = $this->get('form.factory')->create('acme_friend_message');
+            $form = $this->get('form.factory')->create('friend_message');
 
             // ...
         }
     }
 
 If you extend the ``Symfony\Bundle\FrameworkBundle\Controller\Controller`` class, you can simply call::
 
-    $form = $this->createForm('acme_friend_message');
+    $form = $this->createForm('friend_message');
 
 You can also easily embed the form type into another form::
 
     // inside some other "form type" class
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
-        $builder->add('message', 'acme_friend_message');
+        $builder->add('message', 'friend_message');
     }
 
 .. _cookbook-form-events-submitted-data: