Refactor #3832 Refactor #3833 - For TieredMenu

api-generator/components/tieredmenu.js

@@ -41,6 +41,10 @@ const TieredMenuSlots = [
     {
         name: 'item',
         description: 'Template of a menuitem.'
+    },
+    {
+        name: 'submenuicon',
+        description: 'Custom submenu icon template.'
     }
 ];