add deferStream: true to auth code example (#1385)

Co-authored-by: Sarah <[email protected]>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: 3 people

src/routes/solid-start/advanced/auth.mdx

@@ -50,9 +50,12 @@ const getPrivatePosts = query(async function() {
 })
 
 export default function Page() {
-	const posts = createAsync(() => getPrivatePosts());
+	const posts = createAsync(() => getPrivatePosts(), { deferStream: true });
 }
 ```
 
 Once the user hits this route, the router will attempt to fetch `getPrivatePosts` data.
 If the user is not signed in, `getPrivatePosts` will throw and the router will redirect to the login page.
+
+To prevent errors when opening the page directly, set `deferStream: true`. 
+This would ensure `getPrivatePosts` resolves before the page loads since server-side redirects cannot occur after streaming has started.