Fix an incorrect comment.

tests/rest/client/test_relations.py

@@ -67,9 +67,7 @@ def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.parent_id = res["event_id"]
 
     def test_send_relation(self) -> None:
-        """Tests that sending a relation using the new /send_relation works
-        creates the right shape of event.
-        """
+        """Tests that sending a relation works."""
 
         channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", key="👍")
         self.assertEqual(200, channel.code, channel.json_body)