Docs - Update Clipboard Copy guidelines

[bekah-stephens]

Description

The current page content shows and describes an "Expandable" variation, but doesn't show a visual or explanation for the differences between the collapsed and expanded versions.

Recommendation / Fix

1. Update the visual to show both states --addressed in this PR
2. Update the description text to explain the difference between the two

[edonehoo]

Just noting a few other docs changes that would be good to include:

• Some of the sections under usage would probably be better within a variations section
• A few grammar/phrasing/numerics things throughout - do a once-over content edit