[w3c/webauthn] bc8052: Address @equalsJeffH's review comments

  Branch: refs/heads/issue-151-credential-portability
  Home:   https://github.com/w3c/webauthn
  Commit: bc805203c29f4febf5e587568df56ffc304f83f1
      https://github.com/w3c/webauthn/commit/bc805203c29f4febf5e587568df56ffc304f83f1
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-05-02 (Wed, 02 May 2018)

  Changed paths:
    M index.bs

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

See https://github.com/w3c/webauthn/pull/884#pullrequestreview-116428726


  Commit: 1a11551f81ed4254382202f681371b84cdb237b8
      https://github.com/w3c/webauthn/commit/1a11551f81ed4254382202f681371b84cdb237b8
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-05-02 (Wed, 02 May 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Merge two steps of new device enrollment use case


Compare: https://github.com/w3c/webauthn/compare/63c71d866143...1a11551f81ed
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