doc-site: What do the api classes do?

[eigood]

It's nice that the list of overriable css classes are listed; but what does each do? Under what scenarios will a class be used, which api parameters have to be set for it to be activated?

If I am going to provide an additional override(by using classses={{tooltipOpen: classes.volumeControlInactive}} in calling code), then I need to know in what scenario it makes sense to do so.

[eigood]

As a suggestion, the docs should be readable by designer types, not programmer types. I'm trying to prepare the site I'm working on for proper theming, which is what prompted me to upgrade things from 0.20 to 1.0.