add audio description example to VideoPlayer docs

apps/docs/content/components/VideoPlayer.mdx

@@ -6,6 +6,7 @@ description: Use the video player component to enable playback of self-hosted vi
 ---
 
 import {Label} from '@primer/react'
+import {Link, Stack, VideoPlayer} from '@primer/react-brand'
 
 ```js
 import {VideoPlayer} from '@primer/react-brand'
@@ -22,6 +23,22 @@ import {VideoPlayer} from '@primer/react-brand'
 </VideoPlayer>
 ```
 
+## With Audio Description
+
+Videos with important visual information must include an audio description to ensure that the content is accessible to all users.
+
+The audio description can be provided as part of the existing soundtrack, or via a link to an alternate audio-described version.
+
+```jsx live
+<Stack gap="normal">
+  <VideoPlayer title="GitHub media player">
+    <VideoPlayer.Source src="/brand/assets/example.mp4" />
+    <VideoPlayer.Track src="/brand/assets/example.vtt" default />
+  </VideoPlayer>
+  <Link href="#">Watch with audio description</Link>
+</Stack>
+```
+
 ## With poster
 
 ```jsx live
@@ -111,7 +128,7 @@ The `VideoPlayer` component exposes a `useVideo` hook that can be used to contro
 Full documentation for the `useVideo` hook can be found [below](#usevideo-context).
 
 ```tsx live
-() => {
+;() => {
   const MyVideoPlayer = () => {
     const {isPlaying, togglePlaying, seek} = useVideo()