[w3c/webauthn] a96110: fix #866: clarify sentence wrt challenges (#977)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: a96110e1d087a09dada43ceb7fe5a6dc75e004d3
      https://github.com/w3c/webauthn/commit/a96110e1d087a09dada43ceb7fe5a6dc75e004d3
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-07-06 (Fri, 06 Jul 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  fix #866: clarify sentence wrt challenges (#977)

* fix 866

* add link to CollectedClientData/challenge, thx emlun!



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