explain G-7730

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/7-triggers/g-7720.md

@@ -11,7 +11,7 @@ A DML trigger can have multiple triggering events separated by `or` like `before
 
 ``` sql
 create or replace trigger dept_br_u
-before update of department_id or update of department_name
+before update of department_id or update of department_name -- violates also G-7730
 on departments for each row
 begin
    -- will only fire on updates of department_name