[w3c/webauthn] 435225: Add missing commas

  Branch: refs/heads/issue-1020-multiple-credentials
  Home:   https://github.com/w3c/webauthn
  Commit: 43522552ab2e4f5ddf74617c40d72ca954cc4835
      https://github.com/w3c/webauthn/commit/43522552ab2e4f5ddf74617c40d72ca954cc4835
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-09-10 (Mon, 10 Sep 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Add missing commas



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