[webauthn] new commits pushed by equalsJeffH

The following commits were just pushed by equalsJeffH to https://github.com/w3c/webauthn:

* Fix IANA Registration (#1408)

* Update index.bs

Fixes #1400 adds IANA registration for appidExclude and removes allready registerd extensions.  Changes wording from initial registrations to additional registrations.

* Fix section refrence

* Grammer fix

Change wich to that in two places
  by John Bradley

Received on Wednesday, 22 April 2020 19:19:00 UTC