[w3c/webauthn] 9a99d4: Fix typo

  Branch: refs/heads/issue-1019-typo
  Home:   https://github.com/w3c/webauthn
  Commit: 9a99d4b28275459b82ad37ebe66ab13f027857ed
      https://github.com/w3c/webauthn/commit/9a99d4b28275459b82ad37ebe66ab13f027857ed
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-08-08 (Wed, 08 Aug 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Fix typo

This fixes #1019.

https://github.com/w3c/webauthn/issues/1019



      **NOTE:** This service has been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

      Functionality will be removed from GitHub.com on January 31st, 2019.