chore: update changes/ee/feat-13504.en.md

Co-authored-by: zmstone <zmstone@gmail.com>

changes/ee/feat-13504.en.md

@@ -2,4 +2,4 @@ Added a HTTP backend for the authentication mechanism `scram`.
 
 Note: This is not an implementation of the RFC 7804: Salted Challenge Response HTTP Authentication Mechanism.
 
-This backend is an implementation of scram that uses an external web resource as a source of user information.
+This backend is an implementation of scram that uses an external web resource as a source of SCRAM authentication data, including stored key of the client, server key, and the salt. It support other authentication and authorization extension fields like HTTP auth backend, namely: `is_superuser`, `client_attrs`, `expire_at` and `acl`.