[w3c/webauthn] a58365: ignored extn does not return a value (#967)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: a583650f1e98abe83446fcf59d8ae8961be6784e
      https://github.com/w3c/webauthn/commit/a583650f1e98abe83446fcf59d8ae8961be6784e
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-06-27 (Wed, 27 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  ignored extn does not return a value (#967)

* ignored extn does not return a value

* move ignored extensions admonition, thx emlun!



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