Clarify "Fingerprinting mitigation levels of success"

[JensenPaul]

Some clarifications to this section might help:

1. It's not clear which of "the levels of success" is most successful versus least successful. I'm not sure they're exactly distinct level either as there is significant overlap between "decreased fingerprinting surface" and "increased anonymity set", in other words increasing the anonymity set decreases the fingerprinting surface size. This ambiguity is furthered by the paragraph under the list referring to "the levels of success" as "areas". I feel like some of them are orthogonal metrics for fingerprint mitigation success, for example "decreased fingerprinting surface" can be accomplished independently in tandem with increasing "clearable local state". One suggestion would be to instead break them into three separate success metrics: decreased surface size, surface detectability, surface clearability.

2. This section and this other section mention both anonymity sets and entropy. Could we also include an explanation for feature developers of how they differ and why they might use each.