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### WHY are these changes introduced?

Fixes #0000 <!-- link to issue if one exists -->

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  Context about the problem that’s being addressed.
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### WHAT is this pull request doing?

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  Summary of the changes committed.
  Before / after screenshots appreciated for UI changes.
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## <!-- ℹ️ Delete the following for small / trivial changes -->

### How to 🎩

🖥 [Local development instructions](https://github.com/Shopify/polaris-react/blob/master/README.md#development)
🗒 [General tophatting guidelines](https://github.com/Shopify/polaris-react/blob/master/documentation/Tophatting.md)
📄 [Changelog guidelines](https://github.com/Shopify/polaris-react/blob/master/documentation/Versioning%20and%20changelog.md)

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  Give as much information as needed to experiment with the component
  in the playground.
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<details>
<summary>Copy-paste this code in <code>playground/Playground.tsx</code>:</summary>

```jsx
import * as React from 'react';
import {Page} from '@shopify/polaris';

interface State {}

export default class Playground extends React.Component<never, State> {
  render() {
    return (
      <Page title="Playground">
        {/* Add the code you want to test here */}
      </Page>
    );
  }
}
```

</details>

### 🎩 checklist

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

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  When tophatting, please check the UNRELEASED entry for consistency, as per the [guidelines](https://github.com/Shopify/polaris-react/blob/master/documentation/Versioning%20and%20changelog.md).
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