[w3c/webauthn] bd9bc3: Add note about actual implementations of appid. (#...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: bd9bc3ee399eab740563bebfe7927d7627dd5cea
      https://github.com/w3c/webauthn/commit/bd9bc3ee399eab740563bebfe7927d7627dd5cea
  Author: Adam Langley <agl@imperialviolet.org>
  Date:   2018-08-22 (Wed, 22 Aug 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Add note about actual implementations of appid. (#1032)

This change adds a note to the `appid` extension remarking that, in
practice, I don't think anyone actually implements the FIDO FacetID spec
fully and instead checks whether the claimed AppID is same host with the
origin.

Fixes #972.



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