Apply suggestions from code review

Author: amannn

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

@@ -223,12 +223,14 @@ The `locale` that was matched by the middleware is available via the `locale` pa
 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
-}: PropsWithChildren<{ readonly params: Promise<{ locale: string }> }) {
+}: {
+  children: React.ReactNode;
+  params: Promise<{locale: string}>;
+}) {
   // Ensure that the incoming `locale` is valid
   const {locale} = await params;
   if (!hasLocale(routing.locales, locale)) {