chore: remove/update callout regarding supported next version range (#8195)

Author: HuiSF

src/fragments/lib/troubleshooting/common/upgrading.mdx

@@ -136,7 +136,7 @@ npm install aws-amplify@6 @aws-amplify/adapter-nextjs
 
 The `@aws-amplify/adapter-nextjs` package provides adapter functions to enable use of Amplify APIs on the server side of your Next.js app for use cases such as Server Side Rendering (SSR) with the App Router.
 
-Note that v6 supports NextJS v13.5.0 through 14. We recommend upgrading if you are using a version below  13.5.0.
+Note that v6 supports NextJS v13.5.0 through 15. We recommend upgrading if you are using a version below  13.5.0.
 
 <Callout>NextJS v13.5.0 requires Node v16.14.0 or later and NextJS v14+ requires Node v18.17.0 or later</Callout>
 

src/fragments/start/getting-started/next/setup.mdx

@@ -1,7 +1,6 @@
 <Callout>
 
 This tutorial is built using the pages directory from NextJS. To learn more about using Amplify with the NextJS app directory please visit this [documentation page](/gen1/[platform]/build-a-backend/server-side-rendering/set-up-ssr/#use-amplify-with-nextjs-app-router-app-directory).
-**Note:** We currently support Next.js versions 13.5.0 up to 14.x. We are working to support version 15 or newer.
 
 </Callout>
 

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

@@ -32,12 +32,6 @@ This Quickstart guide will walk you through how to build a task list application
 - [git](https://git-scm.com/) v2.14.1 or later
 - If you are new to these technologies, we recommend you go through the official [React](https://react.dev/learn/tutorial-tic-tac-toe), [Next.js](https://nextjs.org/docs/app/getting-started), and [TypeScript](https://www.typescriptlang.org/docs/handbook/typescript-from-scratch.html) tutorials first.
 
-<Callout>
-
-**Note:** We currently support Next.js versions 13.5.0 up to 14.x. We are working to support version 15 or newer.
-
-</Callout>
-
 ## Deploy a fullstack app to AWS
 
 We've created a starter "To-do" application to help get started faster. First, you will create a repository in your GitHub account using our starter Next template.