Update to Vercel guide with example of vercel env variables

Author: oliwolff1

src/content/docs/developer-tools/guides/deploy-on-vercel.mdx

@@ -99,7 +99,7 @@ If you don’t have an existing project, create a project with a starter kit fro
     - KINDE_CLIENT_ID
     - KINDE_CLIENT_SECRET
     - KINDE_ISSUER_URL (Domain in Kinde)
-6. Change the variables as follows, using Vercel values:
+6. Change the variables as follows, using Vercel values (e.g. `https://vercel-nextjs-kinde.vercel.app`):
     - KINDE_SITE_URL
     - KINDE_POST_LOGOUT_REDIRECT_URL
     - KINDE_POST_LOGIN_REDIRECT_URL