Merge branch '6.3' into 6.4

* 6.3:
  [Workflow] Remove registry workflow retrieval occurrences

Author: javiereguiluz

workflow.rst

@@ -1083,7 +1083,7 @@ In a :ref:`flash message <flash-messages>` in your controller::
 
     // $transition = ...; (an instance of Transition)
 
-    // $workflow is a Workflow instance retrieved from the Registry or injected directly (see above)
+    // $workflow is an injected Workflow instance
     $title = $workflow->getMetadataStore()->getMetadata('title', $transition);
     $this->addFlash('info', "You have successfully applied the transition with title: '$title'");