[w3c/webauthn] e36ee7: Clarify that authentication use case example requi...

  Branch: refs/heads/issue-874-clarify-use-case
  Home:   https://github.com/w3c/webauthn
  Commit: e36ee7c6959fd2623ff146fb1dbb77a909469e85
      https://github.com/w3c/webauthn/commit/e36ee7c6959fd2623ff146fb1dbb77a909469e85
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-04-24 (Tue, 24 Apr 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Clarify that authentication use case example requires pairing the phone first