[w3c/webauthn] 3357f0: Address @selfissued's review comments

  Branch: refs/heads/issue-578-pii-considerations
  Home:   https://github.com/w3c/webauthn
  Commit: 3357f0ebefbb51ee96891abda3a1b59c2a1c497c
      https://github.com/w3c/webauthn/commit/3357f0ebefbb51ee96891abda3a1b59c2a1c497c
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-08-15 (Wed, 15 Aug 2018)

  Changed paths:
    M index.bs

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



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