docs: product builder tutorial (#13210)

* initial

* docs: product builder tutorial

www/apps/resources/app/how-to-tutorials/tutorials/preorder/page.mdx

@@ -793,7 +793,7 @@ An API route is created in a `route.ts` file under a sub-directory of the `src/a
 
 <Note>
 
-Refer to the [API routes](!docs!/learn/fundamentals/api-routes) to learn more about them.
+Refer to the [API routes](!docs!/learn/fundamentals/api-routes) documentation to learn more about them.
 
 </Note>