Update Supabase example README. (#33610)

This fixes the deploy button, which wasn't working.

examples/with-supabase-auth-realtime-db/README.md

@@ -1,12 +1,12 @@
-# Example: [Supabase authentication](https://supabase.io/docs/guides/auth) client- and server-side (API routes), and SSR with auth cookie.
+# Supabase Authentication
 
-This example shows how to use Supabase auth on the client and server in both [API routes](https://nextjs.org/docs/api-routes/introduction) and when using [server side rendering (SSR)](https://nextjs.org/docs/basic-features/pages#server-side-rendering).
+This example shows how to use Supabase Auth on the client and server in both [API Routes](https://nextjs.org/docs/api-routes/introduction) and when using [server-side rendering (SSR)](https://nextjs.org/docs/basic-features/pages#server-side-rendering).
 
 ## Deploy with Vercel
 
 The Vercel deployment will guide you through creating a Supabase account and project. After installation of the Supabase integration, all relevant environment variables will be set up so that the project is usable immediately after deployment 🚀
 
-[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https%3A%2F%2Fgithub.com%2Fsupabase%2Fsupabase%2Ftree%2Fmaster%2Fexamples%2Fnextjs-with-supabase-auth&project-name=nextjs-with-supabase-auth&repository-name=nextjs-with-supabase-auth&integration-ids=oac_jUduyjQgOyzev1fjrW83NYOv)
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https://github.com/vercel/next.js/tree/canary/examples/with-supabase-auth-realtime-db&project-name=nextjs-with-supabase-auth&repository-name=nextjs-with-supabase-auth&integration-ids=oac_jUduyjQgOyzev1fjrW83NYOv)
 
 ## Feedback and issues