Docs: need more cmdlet help content

[jazzdelightsme]

A long time ago I started writing some manual MAML (in DbgProvider.dll-Help.xml), but manual MAML is not a lot of fun.

It seems like PlatyPS is the way to go here.

Note that for "about" topics, I don't think PlatyPS will do what I want--it expects .md input in a very particular format, and for "about" topics I'd like to be a little more free-form. But for cmdlet topics, PlatyPS might be just the thing.