Update Layout example videos from youtube (#8985)

<!--
  ☝️How to write a good PR title:
- Prefix it with [ComponentName] (if applicable), for example: [Button]
  - Start with a verb, for example: Add, Delete, Improve, Fix…
  - Give as much context as necessary and as little as possible
  - Prefix it with [WIP] while it’s a work in progress
-->

### WHY are these changes introduced?

The layout example videos were moved to a new channel, this PR updates
the links

<!--
  Context about the problem that’s being addressed.
-->

### WHAT is this pull request doing?

<!--
  Summary of the changes committed.

Before / after screenshots are appreciated for UI changes. Make sure to
include alt text that describes the screenshot.

If you include an animated gif showing your change, wrapping it in a
details tag is recommended. Gifs usually autoplay, which can cause
accessibility issues for people reviewing your PR:

    <details>
      <summary>Summary of your gif(s)</summary>
      <img src="..." alt="Description of what the gif shows">
    </details>
-->

<!-- ℹ️ Delete the following for small / trivial changes -->

### How to 🎩

🖥 [Local development
instructions](https://github.com/Shopify/polaris/blob/main/README.md#local-development)
🗒 [General tophatting
guidelines](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md)
📄 [Changelog
guidelines](https://github.com/Shopify/polaris/blob/main/.github/CONTRIBUTING.md#changelog)

<!--
  Give as much information as needed to experiment with the component
  in the playground.
-->

<details>
<summary>Copy-paste this code in
<code>playground/Playground.tsx</code>:</summary>

```jsx
import React from 'react';
import {Page} from '../src';

export function Playground() {
  return (
    <Page title="Playground">
      {/* Add the code you want to test in here */}
    </Page>
  );
}
```

</details>

### 🎩 checklist

- [ ] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [ ] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [ ] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [ ] Updated the component's `README.md` with documentation changes
- [ ] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

Author: Yuraima Estevez

polaris.shopify.com/content/design/layout.md

@@ -72,20 +72,20 @@ Admin UI card with a horizontal dot button on one side, plus text and a button o
 
 ![](/images/design/layout/example1.png)
 
-<div as="YoutubeVideo" id="D_MsLKbdcGs"></div>
+<div as="YoutubeVideo" id="PLFMcarQd9g"></div>
 
 ### Example 2
 
 Admin UI card with stacked elements, inline links, and a divider. [Edit in sandbox.](https://polaris.shopify.com/playroom/index.html?code=N4Igxg9gJgpiBcIA8AhCAPABABwIZSgEsA7AcwF4AdEADmoD5LjNMkBBAG2wAtcBhXACcojZi1aceuAMoAXXGADWmUrmxUQAFgZNx4pABUY6WZlwBnDdwBM1TADchhXMVlWY%2BEqQCyUHWL0WAAUAVwAjDkJzbhgoTA4XUhDcUhhzXUCkAHojE1FA1lzTCw1sO0gOCEENc3CoENj-ApY2MFlCexhMEkxZGMwAWyFFGFlzXpiATwByTswwmBhmfFg42QgzYjj7KMIIrvXMMBDzdYGYQXMAOgy9bKL8zJQORbihwVISAEliSOIYDQAViazSQABEOoRYIJMFlHncss9XvD9D8-l1cJFSMQangwDAALQLWQAd0WxBBBSQaJIXVU6mo2hAKKpRTMlmoZRAmAAZhBXAB1GCEUjcNzUcwwAZ7CAcPzM27NFgAUTIkWiiqpOWMsnowDs1AAvpqnvhUvQwTAebgQhxZNkUGaYCz9Fkaf8XSwkAAZEiKeh8XhkLqwa22%2B1ZX3Ef0m7Lu52xpGxQZCT7EeNAuzvNPPCBKVVQTMKgJPDAmvRhBSKUiCCAhLYaStKGt1rbUcviPAELwaJkdlhhKrQ3NKORCcUgIg7aHtksFQfCC4AJU8JwLY8EE9sIH78yHy9X5gLBY0247nv0bJKnMpSswQVrA2wpmOpwg50u3WYtWw2CqsmTQQYE%2BflxkOaIIGwL8JmFGFKjATFdxYBIyGSVJMBOLwYNYKN-WkbhIMIHlJkwABxGBZTzXB2n5TA2F-bJcPoG450ybU8g7B0MBdB0XliFFskkXgxyUR5BK4XgBGEUQuPQUQQAAGhAPopTSBAAG0QHgzEYHgJYQAAXSUkkoT6cwNIAdgANhoAzDSAA)
 
 ![](/images/design/layout/example2.png)
 
-<div as="YoutubeVideo" id="VRRakuy85ss"></div>
+<div as="YoutubeVideo" id="P83g0XkJSSA"></div>
 
 ### Example 3
 
 Admin UI card with text on one side, and a button on the opposite side. [Edit in sanbox.](https://polaris.shopify.com/playroom/index.html?code=N4Igxg9gJgpiBcIA8AFAhgcxgPgDoDsACQpAQQBsAHACzQGUAXNMAa0IzUoF5cQAOXniLESFGmgDCaAE5QhIkUgCS%2BcgEt8MQmnUZ8PEAGdKzGAFoARjAYB3GDHy9CF8hFYU1eg2AcMY0pw5uXgAWQQIFBSQAFRgADwZ5SIVSMAY1ADc0P0IGajVDQlcwbLUIIjUAM0I1BgByQqsNDEIAV0MYKEJKiGlCQwY3Fmaa-AzfXoBPABoI5JFK1vJKtXJ1fBbe2GlDacJe-pg1kcppaFa0wznkpAB6WISkm4AhVoZB-GxU9Kyc4tLyndXu9yk9FLcVOscNcSLcxLQpLIknd4fQmKwhHd0FghCBpiA8jAALYwQwIADaIH%2B5Bg8AcIAAuvibGooHkyfByQB2ABsfGmAEYAAwhIUMgC%2BQA)
 
 ![](/images/design/layout/example3.png)
 
-<div as="YoutubeVideo" id="3ww0V5drMhk"></div>
+<div as="YoutubeVideo" id="EmkPsEGsQRM"></div>