chore(docs): update with-i18n-routing.mdx

Author: pnodet

docs/src/pages/docs/getting-started/app-router/with-i18n-routing.mdx

@@ -220,17 +220,15 @@ const withNextIntl = createNextIntlPlugin(
 The `locale` that was matched by the middleware is available via the `locale` param and can be used to configure the document language. Additionally, we can use this place to pass configuration from `i18n/request.ts` to Client Components via `NextIntlClientProvider`.
 
 ```tsx filename="app/[locale]/layout.tsx"
-import {NextIntlClientProvider, Locale, hasLocale} from 'next-intl';
+import {NextIntlClientProvider, hasLocale} from 'next-intl';
 import {notFound} from 'next/navigation';
 import {routing} from '@/i18n/routing';
+import type { PropsWithChildren } from 'react';
 
 export default async function LocaleLayout({
   children,
   params
-}: {
-  children: React.ReactNode;
-  params: Promise<{locale: string}>;
-}) {
+}: PropsWithChildren<{ readonly params: Promise<{ locale: string }> }) {
   // Ensure that the incoming `locale` is valid
   const {locale} = await params;
   if (!hasLocale(routing.locales, locale)) {