Update comments

synapse/handlers/sliding_sync/room_lists.py

@@ -490,8 +490,7 @@ async def _get_rewind_changes_to_current_membership_to_token(
         # time of the `to_token`. In particular, we need to make these fixups:
         #
         # - a) Remove rooms that the user joined after the `to_token`
-        # - b) Add back rooms that the user left after the `to_token`
-        # - c) Update room membership events to the point in time of the `to_token`
+        # - b) Update room membership events to the point in time of the `to_token`
 
         # Fetch membership changes that fall in the range from `to_token` up to
         # `membership_snapshot_token`
@@ -645,16 +644,12 @@ async def get_room_membership_for_user_at_to_token(
 
         # Our working list of rooms that can show up in the sync response
         sync_room_id_set = {
-            # Note: The `room_for_user` we're assigning here will need to be fixed up
-            # (below) because they are potentially from the current snapshot time
-            # instead from the time of the `to_token`.
             room_for_user.room_id: _RoomMembershipForUser(
                 room_id=room_for_user.room_id,
                 event_id=room_for_user.event_id,
                 event_pos=room_for_user.event_pos,
                 membership=room_for_user.membership,
                 sender=room_for_user.sender,
-                # We will update these fields below to be accurate
                 newly_joined=room_id in newly_joined_room_ids,
                 newly_left=room_id in newly_left_room_ids,
                 is_dm=room_id in dm_room_ids,
@@ -675,7 +670,6 @@ async def get_room_membership_for_user_at_to_token(
                 event_pos=left_event_pos,
                 membership=Membership.LEAVE,
                 sender=None,
-                # We will update these fields below to be accurate
                 newly_joined=False,
                 newly_left=True,
                 is_dm=room_id in dm_room_ids,