hive-c0re: trim the tuwunel version-claim doc fix, drop the pinned version number

hive-c0re/src/matrix.rs

@@ -888,8 +888,10 @@ pub async fn ensure_admin_user(client: &reqwest::Client, register_token: &str) -
 /// (`#admins:<server>`). Sends `!admin users make-user-admin @<localpart>:<server>` as
 /// @hive, polls for the bot's "Done:" success response.
 ///
-/// tuwunel 1.6.x does not implement `/_synapse/admin/v2/users`; all admin
-/// operations go through the admin room.
+/// Workaround for a once-missing `/_synapse/admin/v2/users` in tuwunel —
+/// not re-verified against the version currently deployed. Whether the
+/// admin-room polling here can become a direct HTTP call is an open
+/// question tracked on the forge.
 pub async fn promote_user_to_admin(
     client: &reqwest::Client,
     admin_token: &str,