Merge branch '3.4' into 4.2

* 3.4:
  Remove $context argument from example code
  Update dumping-workflows.rst

Author: javiereguiluz

serializer/custom_normalizer.rst

@@ -47,7 +47,7 @@ to customize the normalized data. To do that, leverage the ``ObjectNormalizer``:
             return $data;
         }
 
-        public function supportsNormalization($data, $format = null, array $context = [])
+        public function supportsNormalization($data, $format = null)
         {
             return $data instanceof Topic;
         }

workflow/dumping-workflows.rst

@@ -50,6 +50,9 @@ Inside a Symfony application, you can dump the files with those commands using
     $ php bin/console workflow:dump workflow_name | dot -Tsvg -o workflow_name.svg
     $ php bin/console workflow:dump workflow_name --dump-format=puml | java -jar plantuml.jar -p  > workflow_name.png
 
+    # highlight 'place1' and 'place2' in the dumped workflow
+    $ php bin/console workflow:dump name place1 place2 | dot -Tsvg -o graph.svg
+
 .. note::
 
     The ``dot`` command is part of Graphviz. You can download it and read