Merge branch '5.4' into 6.2

* 5.4:
  Remove an unused reference
  Reword
  Add `Cascade` to list
  Update dic_tags.rst
  [PhpUnitBridge] Add an example for SYMFONY_PHPUNIT_REQUIRE

Author: javiereguiluz

components/phpunit_bridge.rst

@@ -919,9 +919,18 @@ If you have installed the bridge through Composer, you can run it by calling e.g
 .. tip::
 
     It is also possible to require additional packages that will be installed along
-    the rest of the needed PHPUnit packages using the ``SYMFONY_PHPUNIT_REQUIRE``
+    with the rest of the needed PHPUnit packages using the ``SYMFONY_PHPUNIT_REQUIRE``
     env variable. This is specially useful for installing PHPUnit plugins without
-    having to add them to your main ``composer.json`` file.
+    having to add them to your main ``composer.json`` file. The required packages
+    need to be separated with a space.
+
+    .. code-block:: xml
+
+        <!-- phpunit.xml.dist -->
+        <!-- ... -->
+        <php>
+            <env name="SYMFONY_PHPUNIT_REQUIRE" value="vendor/name:^1.2 vendor/name2:^3"/>
+        </php>
 
 Code Coverage Listener
 ----------------------

reference/constraints.rst

@@ -78,6 +78,7 @@ Validation Constraints Reference
    constraints/Valid
    constraints/Traverse
    constraints/CssColor
+   constraints/Cascade
 
 The Validator is designed to validate objects against *constraints*.
 In real life, a constraint could be: "The cake must not be burned". In

reference/dic_tags.rst

@@ -1004,9 +1004,11 @@ and :class:`Symfony\\Component\\Serializer\\Normalizer\\DenormalizerInterface`.
 
 For more details, see :doc:`/serializer`.
 
-The priorities of the default normalizers can be found in the
-:method:`Symfony\\Bundle\\FrameworkBundle\\DependencyInjection\\FrameworkExtension::registerSerializerConfiguration`
-method.
+Run the following command to check the priorities of the default normalizers:
+
+.. code-block:: terminal
+
+    $ php bin/console debug:container --tag serializer.normalizer
 
 .. _dic-tags-translation-loader: