DID Spec Hardening Proposal V3

For those W3C Credentials Community Group members who are not taking
the Wednesday before Thanksgiving off and would like to attend tomorrow's
special DID Spec Closure Call #1, here is the updated DID Spec Hardening
Proposal
<https://docs.google.com/document/d/1je9Bnhe-1tLgP1bfCSUjvbQ_qllwCz042aGncWX7Uio/edit?usp=sharing>
(called V3 because the proposers have iterated it twice based on the
feedback received from the first proposal).

Reviewing this and contrasting it with the current Working Draft
(Decentralized Identifiers V0.7) will be the main topic of tomorrow's call
(10AM Pacific Time/1PM Eastern Time—see the invitation emails earlier on
the mailing list).

=Drummond