Mentioned the new Registry::all() method

Author: javiereguiluz

workflow/usage.rst

@@ -194,6 +194,10 @@ you can get the workflow by injecting the Workflow registry service::
             // pass the workflow name as the second argument
             // $workflow = $workflows->get($post, 'blog_publishing');
 
+            // you can also get all workflows associated with an object, which is useful
+            // for example to show the status of all those workflows in a backend
+            $postWorkflows = $workflows->all($post);
+
             $workflow->can($post, 'publish'); // False
             $workflow->can($post, 'to_review'); // True
 
@@ -213,6 +217,10 @@ you can get the workflow by injecting the Workflow registry service::
     The :class:`Symfony\\Component\\Workflow\\Exception\\TransitionException`
     class was introduced in Symfony 4.1.
 
+.. versionadded:: 4.1
+    The :method:`Symfony\\Component\\Workflow\\Registry::all` method was
+    introduced in Symfony 4.1.
+
 Using Events
 ------------