fixup! feat(federation): support /make_join and /send_join for restricted rooms

correct comment about event field requirements

src/api/server_server.rs

@@ -1795,7 +1795,7 @@ async fn create_join_event(
             .filter_map(|(_, id)| services().rooms.timeline.get_pdu_json(id).ok().flatten())
             .map(PduEvent::convert_to_outgoing_federation_event)
             .collect(),
-        // Event field is required if the room version supports restricted join rules.
+        // Event field is required if we sign the join event.
         event: if sign_join_event {
             Some(
                 to_raw_value(&CanonicalJsonValue::Object(value))