[w3c/webauthn] 63ccd4: Address @equalsJeffH's review comments

  Branch: refs/heads/issue-1014-username-enumeration
  Home:   https://github.com/w3c/webauthn
  Commit: 63ccd475ec8e54ac8ccd01fba7094171c4fe5829
      https://github.com/w3c/webauthn/commit/63ccd475ec8e54ac8ccd01fba7094171c4fe5829
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-08-27 (Mon, 27 Aug 2018)

  Changed paths:
    M index.bs

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



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