docs: change medusa backend link in next.js guide (#4511)

docs/content/starters/nextjs-medusa-starter.mdx

@@ -43,7 +43,7 @@ Instead of manually following this guide to install then later deploy the Next.j
 
 ## Prerequisites
 
-This document assumes you already have a Medusa backend installed. If you don’t, please follow the [Quickstart guide for the Medusa backend](../development/backend/install.mdx) to learn how to do it.
+This document assumes you already have a Medusa backend installed. If you don’t, please follow the [Create Medusa App guide](../create-medusa-app.mdx) to learn how to do it.
 
 You should also have Node.js with v16 or greater installed. You can check your Node.js version with the following command: