[w3c/webauthn] 564fa0: renumber figure references

  Branch: refs/heads/jeffh-fix-24-flow-figures
  Home:   https://github.com/w3c/webauthn
  Commit: 564fa08c5059a6fb7451d6ddea0b68c32f00f61b
      https://github.com/w3c/webauthn/commit/564fa08c5059a6fb7451d6ddea0b68c32f00f61b
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2018-07-24 (Tue, 24 Jul 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  renumber figure references



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