style(discord): trim rename comments

(cherry picked from commit c98bba083850baef0e0ba1d3844703fe8c795924)

gateway/run_topics.py

@@ -435,11 +435,8 @@ class GatewayTopicThreadsMixin:
         copied_source = source
         with suppress(Exception):
             copied_source = dataclasses.replace(source)
-            # ``dataclasses.replace`` intentionally copies only declared fields.
-            # Preserve the in-process transport-owner ref that build_source()
-            # stamps on live inbound events; multiplex routed profiles need it
-            # for side effects such as Discord thread rename, because the
-            # runtime profile may not own the Discord adapter/token.
+            # Keep the live transport owner; multiplex routes may run under a
+            # profile that does not own the Discord adapter/token.
             transport_ref = getattr(source, "_transport_adapter_ref", None)
             if transport_ref is not None:
                 setattr(copied_source, "_transport_adapter_ref", transport_ref)

tests/gateway/test_session_title_rename_lane.py

@@ -119,8 +119,6 @@ def test_title_thread_copy_preserves_transport_adapter_ref(monkeypatch):
         return None
 
     def fake_schedule(coro, loop, logger=None, log_message=None):
-        # The test only inspects the source passed into make_coro; close the
-        # coroutine so pytest does not warn about an unawaited object.
         coro.close()
         return None