[w3c/webauthn] 990b89: Address some of @equalsJeffH's review comments

  Branch: refs/heads/pr-900-post-merge-review
  Home:   https://github.com/w3c/webauthn
  Commit: 990b892c9f8f15f6403a1665d48c5748e9bc38f5
      https://github.com/w3c/webauthn/commit/990b892c9f8f15f6403a1665d48c5748e9bc38f5
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-06-07 (Thu, 07 Jun 2018)

  Changed paths:
    M index.bs

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



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