[w3c/webauthn] 1dd484: adding references

  Branch: refs/heads/balfanz-patch-5
  Home:   https://github.com/w3c/webauthn
  Commit: 1dd484021d437d9046b1b65e90c8b0880a5f6606
      https://github.com/w3c/webauthn/commit/1dd484021d437d9046b1b65e90c8b0880a5f6606
  Author: balfanz <dirk@balfanz.net>
  Date:   2017-11-09 (Thu, 09 Nov 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  adding references

Added references to the definition of user verification.