[Workflow] Remove doc about Registry and tell about tags

Author: lyrixx

workflow.rst

@@ -265,27 +265,18 @@ machine type, use ``camelCased workflow name + StateMachine``::
         }
     }
 
-Alternatively, use the registry::
+.. versionadded:: 6.2
 
-    use App\Entity\BlogPost;
-    use Symfony\Component\Workflow\Registry;
-
-    class MyClass
-    {
-        private $workflowRegistry;
-
-        public function __construct(Registry $workflowRegistry)
-        {
-            $this->workflowRegistry = $workflowRegistry;
-        }
+    All workflows and state machines are tagged since in Symfony 6.2.
 
-        public function toReview(BlogPost $post)
-        {
-            $blogPublishingWorkflow = $this->workflowRegistry->get($post);
+If you want to retrieve all workflows, for documentation purposes for example,
+you can :doc:`inject all
+services</service_container/service_subscribers_locators>` with the following
+tag:
 
-            // ...
-        }
-    }
+* ``workflow``: all workflows and all state machine;
+* ``workflow.workflow``: all workflows;
+* ``workflow.state_machine``: all state machines.
 
 .. tip::