Fix typo

Author: babolivier

synapse/storage/data_stores/main/event_push_actions.py

@@ -428,7 +428,7 @@ def add_push_actions_to_staging(self, event_id, user_id_actions):
             return
 
         # This is a helper function for generating the necessary tuple that
-        # can be used to inert into the `event_push_actions_staging` table.
+        # can be used to insert into the `event_push_actions_staging` table.
         def _gen_entry(user_id, actions):
             is_highlight = 1 if _action_has_highlight(actions) else 0
             return (