[w3c/webauthn] a38ee2: Clarify that RP ID is globally unique

  Branch: refs/heads/vijaybh/lots-of-fpwd-issues
  Home:   https://github.com/w3c/webauthn
  Commit: a38ee2bc8883fab430a454cc7c381b9b104d5395
      https://github.com/w3c/webauthn/commit/a38ee2bc8883fab430a454cc7c381b9b104d5395
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-05-06 (Fri, 06 May 2016)

  Changed paths:
    M index.src.html

  Log Message:
  -----------
  Clarify that RP ID is globally unique

Fixes #38, #16.