Add note about prefetching (vercel#23732)

Fixes vercel#23687



## Bug

- [x] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [x] Make sure the linting passes

docs/api-reference/next/link.md

@@ -57,7 +57,7 @@ export default Home
 - `href` - The path or URL to navigate to. This is the only required prop
 - `as` - Optional decorator for the path that will be shown in the browser URL bar. Before Next.js 9.5.3 this was used for dynamic routes, check our [previous docs](https://nextjs.org/docs/tag/v9.5.2/api-reference/next/link#dynamic-routes) to see how it worked
 - [`passHref`](#if-the-child-is-a-custom-component-that-wraps-an-a-tag) - Forces `Link` to send the `href` property to its child. Defaults to `false`
-- `prefetch` - Prefetch the page in the background. Defaults to `true`. Any `<Link />` that is in the viewport (initially or through scroll) will be preloaded. Prefetch can be disabled by passing `prefetch={false}`. Pages using [Static Generation](/docs/basic-features/data-fetching.md#getstaticprops-static-generation) will preload `JSON` files with the data for faster page transitions
+- `prefetch` - Prefetch the page in the background. Defaults to `true`. Any `<Link />` that is in the viewport (initially or through scroll) will be preloaded. Prefetch can be disabled by passing `prefetch={false}`. Pages using [Static Generation](/docs/basic-features/data-fetching.md#getstaticprops-static-generation) will preload `JSON` files with the data for faster page transitions. Prefetching is only enabled in production.
 - [`replace`](#replace-the-url-instead-of-push) - Replace the current `history` state instead of adding a new url into the stack. Defaults to `false`
 - [`scroll`](#disable-scrolling-to-the-top-of-the-page) - Scroll to the top of the page after a navigation. Defaults to `true`
 - [`shallow`](/docs/routing/shallow-routing.md) - Update the path of the current page without rerunning [`getStaticProps`](/docs/basic-features/data-fetching.md#getstaticprops-static-generation), [`getServerSideProps`](/docs/basic-features/data-fetching.md#getserversideprops-server-side-rendering) or [`getInitialProps`](/docs/api-reference/data-fetching/getInitialProps.md). Defaults to `false`