add some missing getSession warnings (#21436)

apps/docs/content/guides/auth/auth-helpers/nextjs.mdx

@@ -73,7 +73,7 @@ export async function middleware(req) {
   const supabase = createMiddlewareClient({ req, res })
 
   // Refresh session if expired - required for Server Components
-  await supabase.auth.getSession()
+  await supabase.auth.getUser()
 
   return res
 }

apps/docs/spec/supabase_js_v2.yml

@@ -825,7 +825,7 @@ functions:
     notes: |
       - This method fetches the user object from the database instead of local session.
       - This method is useful for checking if the user is authorized because it validates the user's access token JWT on the server.
-      - Should be used only when you require the most current user data. For faster results, `getSession().session.user` is recommended.
+      - Should always be used when checking for user authorization on the server. On the client, you can instead use `getSession().session.user` for faster results. `getSession` is insecure on the server.
     examples:
       - id: get-the-logged-in-user-with-the-current-existing-session
         name: Get the logged in user with the current existing session