Minor tweak

Author: javiereguiluz

reference/configuration/framework.rst

@@ -2669,7 +2669,7 @@ enable_annotations
 
 **type**: ``boolean`` **default**: ``true``
 
-If this option is enabled, validation constraints can be defined using annotations or attributes.
+If this option is enabled, validation constraints can be defined using annotations or `PHP attributes`_.
 
 .. deprecated:: 6.4
 
@@ -2681,7 +2681,7 @@ enable_attributes
 
 **type**: ``boolean`` **default**: ``true``
 
-If this option is enabled, validation constraints can be defined using attributes.
+If this option is enabled, validation constraints can be defined using `PHP attributes`_.
 
 translation_domain
 ..................
@@ -2884,7 +2884,7 @@ enable_attributes
 
 **type**: ``boolean`` **default**: ``true``
 
-If this option is enabled, serialization groups can be defined using attributes.
+If this option is enabled, serialization groups can be defined using `PHP attributes`_.
 
 .. seealso::
 
@@ -3850,3 +3850,4 @@ the ``#[WithLogLevel]`` attribute::
 .. _`utf-8 modifier`: https://www.php.net/reference.pcre.pattern.modifiers
 .. _`Link HTTP header`: https://tools.ietf.org/html/rfc5988
 .. _`SMTP session`: https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#SMTP_transport_example
+.. _`PHP attributes`: https://www.php.net/manual/en/language.attributes.overview.php