Update api.rst

docs/api.rst

@@ -3063,10 +3063,11 @@ of :class:`enum.Enum`.
         a :class:`Member` with the ID of the person who triggered the automod rule.
 
         When this is the action, the type of :attr:`~AuditLogEntry.extra` is
-        set to an unspecified proxy object with 2 attributes:
+        set to an unspecified proxy object with 3 attributes:
 
         - ``automod_rule_name``: The name of the automod rule that was triggered.
         - ``automod_rule_trigger_type``: A :class:`AutoModRuleTriggerType` representation of the rule type that was triggered.
+        - ``channel``: The channel of the message sent by the member when they were flagged. `None` if the member was quarantined when they just joined the guild.
 
         When this is the action, :attr:`AuditLogEntry.changes` is empty.