ZKP section needs work

[brentzundel]

My concern with the section is not that it talks about ZKPs and how they may be used with DIDs, my concern is that it doesn't.

The guidance in the section is to 1) use proper curves for ZKPs, 2) not use ZKP proof formats tied to specific ledger technology, and 3) not store schemas on ledgers.

What does this guidance have to do with DIDs?

I recommend this section be removed from the implementation guide.