Update synapse/server_notices/resource_limits_server_notices.py

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

synapse/server_notices/resource_limits_server_notices.py

@@ -127,7 +127,7 @@ class ResourceLimitsServerNotices(object):
 
         Args:
             user_id (str): user to notify
-            ref_events ([]): The list of pinned events that are unrelated to
+            ref_events (list[str]): The event_ids of pinned events that are unrelated to
             limit blocking and need to be preserved.
         """
         content = {"pinned": ref_events}