Sliding Sync: Add typing notification extension (MSC3961) (#17505)

[MSC3961](https://github.com/matrix-org/matrix-spec-proposals/pull/3961): Sliding Sync Extension: Typing Notifications

Based on
[MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575):
Sliding Sync

1 files changed, 4 insertions, 0 deletions

diff --git a/synapse/handlers/receipts.py b/synapse/handlers/receipts.py

index d04c76be2a..c776654d12 100644
--- a/synapse/handlers/receipts.py
+++ b/synapse/handlers/receipts.py
@@ -288,6 +288,10 @@ class ReceiptEventSource(EventSource[MultiWriterStreamToken, JsonMapping]):
         explicit_room_id: Optional[str] = None,
         to_key: Optional[MultiWriterStreamToken] = None,
     ) -> Tuple[List[JsonMapping], MultiWriterStreamToken]:
+        """
+        Find read receipts for given rooms (> `from_token` and <= `to_token`)
+        """
+
         if to_key is None:
             to_key = self.get_current_key()