[w3c/webauthn] 8b6b7e: Reword definitions of |authenticators|

  Branch: refs/heads/pr-900-post-merge-review
  Home:   https://github.com/w3c/webauthn
  Commit: 8b6b7e1ded0f64806da8a739f4879bc5edfc7c6f
      https://github.com/w3c/webauthn/commit/8b6b7e1ded0f64806da8a739f4879bc5edfc7c6f
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-06-07 (Thu, 07 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Reword definitions of |authenticators|



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