Added a link to the related RFC

Author: javiereguiluz

reference/configuration/framework.rst

@@ -3035,7 +3035,7 @@ enabled
 
 **type**: ``boolean`` **default**: ``true`` or ``false`` depending on your installation
 
-Adds a Link HTTP header to the response.
+Adds a `Link HTTP header`_ to the response.
 
 workflows
 ~~~~~~~~~
@@ -3210,3 +3210,4 @@ to know their differences.
 .. _`session.cache-limiter`: https://www.php.net/manual/en/session.configuration.php#ini.session.cache-limiter
 .. _`Microsoft NTLM authentication protocol`: https://docs.microsoft.com/en-us/windows/win32/secauthn/microsoft-ntlm
 .. _`utf-8 modifier`: https://www.php.net/reference.pcre.pattern.modifiers
+.. _`Link HTTP header`: https://tools.ietf.org/html/rfc5988