Topic: update comment describing rabbitmq triggers

tildes/tildes/models/topic/topic.py

@@ -58,8 +58,9 @@ class Topic(DatabaseModel):
         - last_activity_time will be updated by insertions, deletions, and updates to
           is_deleted in comments.
       Outgoing:
-        - Inserting a row or updating markdown will send a rabbitmq message for
-          "topic.created" or "topic.edited" respectively.
+        - Inserting a row will send a rabbitmq "topic.created" message.
+        - Updating markdown will send a rabbitmq "topic.edited" message.
+        - Updating link will send a rabbitmq "topic.link_edited" message.
       Internal:
         - deleted_time will be set when is_deleted is set to true
     """