docs: update readme (#2449)

Author: orinokai

README.md

@@ -2,6 +2,11 @@
 
 # Next.js Runtime
 
+> [!NOTE]  
+> Next.js Runtime v5 is available for early access! Please note that this repository is for the current version (v4) of
+> the Next.js Runtime, and the early access version is not yet available in this repository.
+> [Learn more](https://docs.netlify.com/frameworks/next-js/overview/).
+
 Next.js is supported natively on Netlify, and in most cases you will not need to install or configure anything. This
 repo includes the packages used to support Next.js on Netlify.
 
@@ -16,10 +21,10 @@ commands separately will not work, because the Next.js Runtime will not generate
 If you use [`next/image`](https://nextjs.org/docs/basic-features/image-optimization), your images will be automatically
 optimized at runtime, ensuring that they are served at the best size and format. The image will be processed on the
 first request which means it may take longer to load, but the generated image is then cached and served as a static file
-to future visitors. By default, Next.js will deliver WebP images if the browser supports it. WebP is a modern image format
-with wide browser support that will usually generate smaller files than PNG or JPG. Additionally, you can enable AVIF
-format, which is often even smaller in filesize than WebP. The drawback is that with particularly large images, AVIF images may
-take too long to generate, and the function times-out. You can configure
+to future visitors. By default, Next.js will deliver WebP images if the browser supports it. WebP is a modern image
+format with wide browser support that will usually generate smaller files than PNG or JPG. Additionally, you can enable
+AVIF format, which is often even smaller in filesize than WebP. The drawback is that with particularly large images,
+AVIF images may take too long to generate, and the function times-out. You can configure
 [the supported image formats](https://nextjs.org/docs/api-reference/next/image#acceptable-formats) in your
 `next.config.js` file.
 
@@ -91,7 +96,10 @@ Note that Netlify has a minimum TTL of 60 seconds for revalidation.
 
 ## Disable Static 404 on Dynamic Routes with fallback:false
 
-Currently when hitting a non-prerendered path with `fallback=false` it will default to a 404 page. You can now change this default setting by using the environemnt variable `LEGACY_FALLBACK_FALSE=true`. With the environment variable set, those non-prerendered paths will now be routed through using the ISR Handler and will allow you to add redirects for those non-prerendered paths. 
+Currently when hitting a non-prerendered path with `fallback=false` it will default to a 404 page. You can now change
+this default setting by using the environemnt variable `LEGACY_FALLBACK_FALSE=true`. With the environment variable set,
+those non-prerendered paths will now be routed through using the ISR Handler and will allow you to add redirects for
+those non-prerendered paths.
 
 ## Use with `next export`
 
@@ -190,13 +198,15 @@ npm test
 
 ### End-to-end tests
 
-In order to run the end-to-end (E2E) tests, you'll need to be logged in to Netlify. You can do this using the [Netlify CLI](https://github.com/netlify/cli) with the command:
+In order to run the end-to-end (E2E) tests, you'll need to be logged in to Netlify. You can do this using the
+[Netlify CLI](https://github.com/netlify/cli) with the command:
 
 ```shell
 netlify login
 ```
 
-Alternatively, you can set an environment variable `NETLIFY_AUTH_TOKEN` to a valid Netlify personal access token. This can be obtained from the [Netlify UI](https://docs.netlify.com/cli/get-started/#obtain-a-token-in-the-netlify-ui).
+Alternatively, you can set an environment variable `NETLIFY_AUTH_TOKEN` to a valid Netlify personal access token. This
+can be obtained from the [Netlify UI](https://docs.netlify.com/cli/get-started/#obtain-a-token-in-the-netlify-ui).
 
 Then run the E2E tests if logged in:
 
@@ -210,7 +220,8 @@ Or if using an access token:
 NETLIFY_AUTH_TOKEN=your-token-here npm run test:next
 ```
 
-_Note: The E2E tests will be deployed to a Netlify owned site. To deploy to your own site then set the environment variable `NETLIFY_SITE_ID` to your site ID._
+_Note: The E2E tests will be deployed to a Netlify owned site. To deploy to your own site then set the environment
+variable `NETLIFY_SITE_ID` to your site ID._
 
 ## Feedback