[w3c/webauthn] f41cf8: Tpm attestation fields clarification (#791)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: f41cf83849f1725d545e14f1bb84f5569954b548
      https://github.com/w3c/webauthn/commit/f41cf83849f1725d545e14f1bb84f5569954b548
  Author: Akshay Kumar <akshayku@microsoft.com>
  Date:   2018-02-08 (Thu, 08 Feb 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Tpm attestation fields clarification (#791)

* Tpm attestation fields clarifications

* added reference to the Standard Attestation Structure table as it is hard to understand the field names without...

* added reference for TPMS_CERTIFY_INFO

* NitBit: Incorporate comments from Alex, Mike