Merge branch '6.4' into 7.0

* 6.4:
  Remove 5.x versionadded directives
  [#16895] Remove last center align
  [#16895] Add alt description to new images

Author: wouterj

components/var_dumper.rst

@@ -483,6 +483,7 @@ then its dump representation::
     dump($var);
 
 .. image:: /_images/components/var_dumper/10-uninitialized.png
+    :alt: Dump output where the uninitialized property is represented by a question mark followed by the type definition.
 
 .. versionadded:: 6.4
 

configuration/micro_kernel_trait.rst

@@ -166,12 +166,6 @@ be automatically registered as an extension. You can learn more about it in
 the dedicated section about
 :ref:`managing configuration with extensions <components-dependency-injection-extension>`.
 
-.. versionadded:: 5.2
-
-    The automatic registration of the kernel as an extension when implementing the
-    :class:`Symfony\\Component\\DependencyInjection\\Extension\\ExtensionInterface`
-    was introduced in Symfony 5.2.
-
 It is also possible to implement the ``EventSubscriberInterface`` to handle
 events directly from the kernel, again it will be registered automatically::
 

security/login_link.rst

@@ -271,7 +271,6 @@ number::
 This will send an email like this to the user:
 
 .. image:: /_images/security/login_link_email.png
-   :align: center
    :alt: A default Symfony e-mail containing the text "Click on the button below to confirm you want to sign in" and the button with the login link.
 
 .. tip::

service_container/tags.rst

@@ -541,11 +541,6 @@ To answer this, change the service declaration:
                 </services>
             </container>
 
-    .. versionadded:: 5.1
-
-        The possibility to add the ``name`` attribute to a tag in XML and YAML
-        formats was introduced in Symfony 5.1.
-
 .. tip::
 
     In YAML format, you may provide the tag as a simple string as long as