docs: Fix SvelteKit OAuth PCKE flow syntax (#39940) (#39944)

apps/docs/content/_partials/oauth_pkce_flow.mdx

@@ -123,12 +123,12 @@ export const GET = async (event) => {
   if (code) {
     const { error } = await supabase.auth.exchangeCodeForSession(code)
     if (!error) {
-      throw redirect(303, `/${next.slice(1)}`);
+      redirect(303, `/${next.slice(1)}`);
     }
   }
 
   // return the user to an error page with instructions
-  throw redirect(303, '/auth/auth-code-error');
+  redirect(303, '/auth/auth-code-error');
 };
 ```