Fix on AppRouter mention in Pages Router Page - Update index.mdx (#7979)

Author: GabrielAmazonas

src/pages/[platform]/start/quickstart/nextjs-pages-router/index.mdx

@@ -26,7 +26,7 @@ export function getStaticProps(context) {
 
 ## Pre-requisites
 
-This Quickstart guide will walk you through how to build a task list application with TypeScript, Next.js **App Router with Client Components**, and React. Before you begin, make sure you have the following installed:
+This Quickstart guide will walk you through how to build a task list application with TypeScript, Next.js **Pages Router with Client Components**, and React. Before you begin, make sure you have the following installed:
 
 - [Node.js](https://nodejs.org/) v14.x or later
 - [npm](https://www.npmjs.com/) v6.14.4 or later