docs: Add inline documentation for Link props

packages/next/client/link.tsx

@@ -27,14 +27,60 @@ type OptionalKeys<T> = {
 }[keyof T]
 
 type InternalLinkProps = {
+  /**
+   * The path or URL to navigate to. It can also be an object.
+   *
+   * @example https://nextjs.org/docs/api-reference/next/link#with-url-object
+   */
   href: Url
+  /**
+   * 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. Note: when this path differs from the one provided in `href` the previous `href`/`as` behavior is used as shown in the [previous docs](https://nextjs.org/docs/tag/v9.5.2/api-reference/next/link#dynamic-routes).
+   *
+   * @deprecated
+   */
   as?: Url
+  /**
+   * Replace the current `history` state instead of adding a new url into the stack.
+   *
+   * @defaultValue `false`
+   */
   replace?: boolean
+  /**
+   * Replace the current `history` state instead of adding a new url into the stack.
+   *
+   * @defaultValue `false`
+   */
   scroll?: boolean
+  /**
+   * Update the path of the current page without rerunning [`getStaticProps`](/docs/basic-features/data-fetching/get-static-props.md), [`getServerSideProps`](/docs/basic-features/data-fetching/get-server-side-props.md) or [`getInitialProps`](/docs/api-reference/data-fetching/get-initial-props.md).
+   *
+   * @defaultValue `false`
+   */
   shallow?: boolean
+  /**
+   * Forces `Link` to send the `href` property to its child.
+   *
+   * @defaultValue `false`
+   */
   passHref?: boolean
+  /**
+   * Prefetch the page in the background.
+   * Any `<Link />` that is in the viewport (initially or through scroll) will be preloaded.
+   * Prefetch can be disabled by passing `prefetch={false}`. When `prefetch` is set to `false`, prefetching will still occur on hover. Pages using [Static Generation](/docs/basic-features/data-fetching/get-static-props.md) will preload `JSON` files with the data for faster page transitions. Prefetching is only enabled in production.
+   *
+   * @defaultValue `true`
+   */
   prefetch?: boolean
+  /**
+   * The active locale is automatically prepended. `locale` allows for providing a different locale.
+   * When `false` `href` has to include the locale as the default behavior is disabled.
+   */
   locale?: string | false
+  /**
+   * Official support for `<Link href="/about">About</Link>` / `<Link href="/about"><CustomComponent /></Link>` / `<Link href="/about"><strong>About</strong></Link>` where `<Link>` always renders `<a>` without edge cases where it doesn’t render `<a>`. You'll no longer have to put an empty `<a>` in `<Link>` with this enabled.
+   * @defaultValue `true`
+   * @see https://github.com/vercel/next.js/commit/489e65ed98544e69b0afd7e0cfc3f9f6c2b803b7
+   */
   legacyBehavior?: boolean
   // e: any because as it would otherwise overlap with existing types
   /**