docs: add changelog for PR 13923

changes/ce/feat-13923.en.md

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+Added `zone` to authentication, authorization and mountpoint template.
+
+Prior to this change, if one wants to use `zone` name in authentication or authorization rules, they would have to use `client_attrs`.
+Now `${zone}` can be used directly in authentication and authentication.
+
+As an example, here is an ACL rule making use of `zone`: `{allow, all, all, [${zone}/${username}/#]}`.