minor #17473 [Validator] enable_annotations also read attributes (alamirault)

This PR was submitted for the 6.2 branch but it was merged into the 5.4 branch instead.

Discussion
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[Validator] `enable_annotations` also read attributes

[AnnotationLoader](https://symfony.com/doc/current/components/validator/resources.html#the-annotationloader) doc tell attributes are read but in `enable_annotations` reference it's not said

Commits
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c654ef8 enable_annotations read also attributes

Author: javiereguiluz

reference/configuration/framework.rst

@@ -2578,7 +2578,7 @@ 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
 ..................
@@ -2787,7 +2787,7 @@ 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::