[w3c/webauthn] 54f8a9: Address most of @equalsJeffH's review comments

  Branch: refs/heads/issue-151-credential-portability
  Home:   https://github.com/w3c/webauthn
  Commit: 54f8a98f849fc00672d834936e89727acef30782
      https://github.com/w3c/webauthn/commit/54f8a98f849fc00672d834936e89727acef30782
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-06-13 (Wed, 13 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Address most of @equalsJeffH's review comments



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