enable_annotations read also attributes

Author: alamirault

reference/configuration/framework.rst

@@ -2573,7 +2573,7 @@ enable_annotations
 
 **type**: ``boolean`` **default**: ``false``
 
-If this option is enabled, validation constraints can be defined using annotations.
+If this option is enabled, validation constraints can be defined using annotations or attributes.
 
 translation_domain
 ..................
@@ -2782,7 +2782,7 @@ enable_annotations
 
 **type**: ``boolean`` **default**: ``false``
 
-If this option is enabled, serialization groups can be defined using annotations.
+If this option is enabled, serialization groups can be defined using annotations or attributes.
 
 .. seealso::