docs: Update code block line number in app-router.mdx (#2095)

Author: amannn

docs/src/pages/docs/getting-started/app-router.mdx

@@ -129,7 +129,7 @@ module.exports = withNextIntl(nextConfig);
 
 To make your request configuration available to Client Components, you can wrap the `children` in your root layout with `NextIntlClientProvider`.
 
-```tsx filename="app/layout.tsx" {7}
+```tsx filename="app/layout.tsx" {11}
 import {NextIntlClientProvider} from 'next-intl';
 
 type Props = {