[w3c/webauthn] a3c642: spell-out enums values. Give better eplxanation o...

  Branch: refs/heads/authnr-sel-matcherprotection
  Home:   https://github.com/w3c/webauthn
  Commit: a3c642ecd68f5e6c7db76b0a6fb08fc2db75ccc0
      https://github.com/w3c/webauthn/commit/a3c642ecd68f5e6c7db76b0a6fb08fc2db75ccc0
  Author: rlin1 <rolf@noknok.com>
  Date:   2017-05-30 (Tue, 30 May 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  spell-out enums values.  Give better eplxanation on when to use which enum