Merge branch '5.2' into 5.x

* 5.2:
  [Validator] Add a comma after the last array item in a multi-line array

Author: OskarStark

validation/raw_values.rst

@@ -88,7 +88,7 @@ Validation of arrays is possible using the ``Collection`` constraint::
                 new Assert\Collection([
                     'slug' => [
                         new Assert\NotBlank(),
-                        new Assert\Type(['type' => 'string'])
+                        new Assert\Type(['type' => 'string']),
                     ],
                     'label' => [
                         new Assert\NotBlank(),