[w3c/webauthn] dbdf61: Address more review comments

  Branch: refs/heads/issue-1014-username-enumeration
  Home:   https://github.com/w3c/webauthn
  Commit: dbdf619672bdd69f0b7856ca516250190ae25c18
      https://github.com/w3c/webauthn/commit/dbdf619672bdd69f0b7856ca516250190ae25c18
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-08-29 (Wed, 29 Aug 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Address more review comments



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