[w3c/webauthn] e1faf5: Restrict WebAuthn support to valid domains (#515)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: e1faf59f86e5903ce4063c1b68b832b93bf1a5f3
      https://github.com/w3c/webauthn/commit/e1faf59f86e5903ce4063c1b68b832b93bf1a5f3
  Author: Mike Jones <Michael.Jones@microsoft.com>
  Date:   2017-08-02 (Wed, 02 Aug 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Restrict WebAuthn support to valid domains (#515)

Restrict WebAuthn support to valid domains

* Clarified valid domain note, as suggested by Jeff Hodges