minor #7349 [Validation] Revert #7249 (peterrehm)

This PR was merged into the 2.7 branch.

Discussion
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[Validation] Revert #7249

This reverts commit 6c3ff5e since
due to symfony/symfony#21183 the logic is meanwhile changed.

Commits
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3250ed4 Revert "Fixed wrong inheritance information"

Author: xabbuh

validation/groups.rst

@@ -166,11 +166,11 @@ the class name or the string ``Default``.
     object that's actually the one being validated.
 
     If you have inheritance (e.g. ``User extends BaseUser``) and you validate
-    with the class name of the subclass (i.e. ``User``), then only constraints
-    in the ``User`` will be validated. To validate the parent constraints as 
-    well you need to provide multiple groups (i.e ``User`` and ``BaseUser``) or
-    ``Default``.
-    
+    with the class name of the subclass (i.e. ``User``), then all constraints
+    in the ``User`` and ``BaseUser`` will be validated. However, if you
+    validate using the base class (i.e. ``BaseUser``), then only the default
+    constraints in the ``BaseUser`` class will be validated.
+
 To tell the validator to use a specific group, pass one or more group names
 as the third argument to the ``validate()`` method::