docs: added gift message guide (#12833)

www/apps/resources/generated/generated-how-to-tutorials-sidebar.mjs

@@ -366,6 +366,15 @@ const generatedgeneratedHowToTutorialsSidebarSidebar = {
           "description": "Learn how to send abandoned cart notifications to customers.",
           "children": []
         },
+        {
+          "loaded": true,
+          "isPathHref": true,
+          "type": "link",
+          "title": "Add Gift Message",
+          "path": "/how-to-tutorials/tutorials/gift-message",
+          "description": "Learn how to add a gift option and message to items in the cart.",
+          "children": []
+        },
         {
           "loaded": true,
           "isPathHref": true,