[w3c/webauthn] 2ceeb7: add domain-only rationale in two places

  Branch: refs/heads/jeffh-fix-517-editorial
  Home:   https://github.com/w3c/webauthn
  Commit: 2ceeb78e7a04b4e74552976b489e2e02d96dab17
      https://github.com/w3c/webauthn/commit/2ceeb78e7a04b4e74552976b489e2e02d96dab17
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2018-06-28 (Thu, 28 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  add domain-only rationale in two places



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