[w3c/webauthn] 594501: Address review comment

  Branch: refs/heads/authenticator-taxonomy
  Home:   https://github.com/w3c/webauthn
  Commit: 5945017a25332720f232eb2cfc83f104df1768a9
      https://github.com/w3c/webauthn/commit/5945017a25332720f232eb2cfc83f104df1768a9
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-06-19 (Tue, 19 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Address review comment

See https://github.com/w3c/webauthn/pull/842#discussion_r195582774



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