s/outstanding/in flight

draft-ietf-quic-transport.md

@@ -1069,9 +1069,9 @@ to cease using the connection IDs when requested can result in connection
 failures, as the issuing endpoint might be unable to continue using the
 connection IDs with the active connection.
 
-An endpoint SHOULD limit the number of outstanding RETIRE_CONNECTION_ID frames
+An endpoint SHOULD limit the number of in flight RETIRE_CONNECTION_ID frames
 to bound the necessary state. In order to allow a peer to retire all previously
-issued connection IDs, the limit on the number of outstanding
+issued connection IDs, the limit on the number of in flight
 RETIRE_CONNECTION_IDs SHOULD be at least the active_connection_id_limit. An
 endpoint MAY choose to treat having too many connection IDs in need of
 retirement as a connection error of type CONNECTION_ID_LIMIT_ERROR.