[w3c/webauthn] 794386: Incorporate feedback from @equalsJeffH

  Branch: refs/heads/vgb-explicit-rpid
  Home:   https://github.com/w3c/webauthn
  Commit: 7943865cd0d71c329dbbc822e1e209e60364a397
      https://github.com/w3c/webauthn/commit/7943865cd0d71c329dbbc822e1e209e60364a397
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-09-16 (Fri, 16 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Incorporate feedback from @equalsJeffH