docs: Add notes about email confirmation for Spotify login (#20924)

* docs: Add notes about email confirmation for Shopify login

* Update apps/docs/pages/guides/auth/social-login/auth-spotify.mdx

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

* Update apps/docs/pages/guides/auth/social-login/auth-spotify.mdx

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

* Update apps/docs/pages/guides/auth/social-login/auth-spotify.mdx

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

* Update apps/docs/pages/guides/auth/social-login/auth-spotify.mdx

---------

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

apps/docs/pages/guides/auth/social-login/auth-spotify.mdx

@@ -52,6 +52,14 @@ Under `Redirect URIs`:
 
 ## Add login code to your client app
 
+The following outlines the steps to sign in using Spotify with Supabase Auth.
+
+1. Call the signin method from the client library.
+1. The user is redirected to the Spotify login page.
+1. After completing the sign-in process, the user will be redirected to your app with an error that says the email address needs to be confirmed. Simultaneously the user receives a confirmation email from Supabase Auth.
+1. The user clicks the confirmation link in the email.
+1. The user is brought back to the app and is now signed in.
+
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