[w3c/webauthn] 768368: Fix spelling mistake

  Branch: refs/heads/client-device-platform-terminology
  Home:   https://github.com/w3c/webauthn
  Commit: 7683687d6f45a6b62927244abca038c3733d4d1f
      https://github.com/w3c/webauthn/commit/7683687d6f45a6b62927244abca038c3733d4d1f
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-07-18 (Wed, 18 Jul 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Fix spelling mistake



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