bug: Component docs: "Copy" code block button appears above toolbar

[zrev2220]

See the screen recording below (captured on this page, though the issue appears across other components' pages).

Likely, this is just a z-index issue with the "Copy" buttons.

https://user-images.githubusercontent.com/22283396/138758366-c42004a6-9f74-4a5d-b732-2dc96a94be2a.mp4

[jcesarmobile]

Looks like it was fixed