[w3c/webauthn] d1a49f: revise RP ID definition and Note

  Branch: refs/heads/jeffh-fix-963-RPID-note-confusing
  Home:   https://github.com/w3c/webauthn
  Commit: d1a49fbb0b8a67ac57be0743fc58ee129d4c15cc
      https://github.com/w3c/webauthn/commit/d1a49fbb0b8a67ac57be0743fc58ee129d4c15cc
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2018-06-25 (Mon, 25 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  revise RP ID definition and Note



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