[docs]: Code overflows parent container

[andrewdoro]

Description

Code overflows the parent container.

Steps to reproduce

1. Go to https://opensource.adobe.com/spectrum-css/get-started.html
2. Change window width to less than 842px
3. Observe code overflow

Expected behavior

A good solution would be to add overflow: auto to the pre tag. Just assign me to this and I can work on it.

Screenshots

Environment

• Spectrum CSS version:
• Browser(s) and OS(s):

Additional context