🐛 [BUG] - Broken docs page layout for "Subdomain nav bar"

[isaac-souza]

Describe the bug

Correct

Broken

Content is too wide and is overflowing the container, it appears.

Reproduction steps

1. Go to 'https://primer.style/brand/components/SubdomainNavBar'
2. See weird layout

Expected behavior

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Screenshots

![DESCRIPTION](LINK.png)

Browsers

No response

OS

No response