[w3c/webauthn] 1fe735: Address @equalsJeffH's review comments

  Branch: refs/heads/issue-578-pii-considerations
  Home:   https://github.com/w3c/webauthn
  Commit: 1fe735db3ad1b91b29a4cf0c665848b3b9e48ac1
      https://github.com/w3c/webauthn/commit/1fe735db3ad1b91b29a4cf0c665848b3b9e48ac1
  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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