[whatwg/url] Clarify A-label vs U-label for public suffix / registrable domain (#396)

At the moment the Public Suffix List allows implementations to do either. The URL Standard clearly centers around A-label (ASCII) for everything normalized and expects the same from public suffix and registrable domain (due to the way it performs comparisons with them).

Filing this as a follow-up to #391 since we don't expose public suffix and registrable domain directly (yet).

I'd suggest we change

> Return the public suffix obtained by executing the algorithm defined by the Public Suffix List on host.

to

> Return the public suffix obtained by executing the algorithm defined by the Public Suffix List on host, using A-labels.

and do likewise for registrable domain.

Does that work @sleevi & @mikewest?

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