[w3c/webauthn] 323789: minor editorial fixes

  Branch: refs/heads/jeffh-fix-1658-device-bound-key-extension
  Home:   https://github.com/w3c/webauthn
  Commit: 32378966857e501f43356036abe697f514f70a24
      https://github.com/w3c/webauthn/commit/32378966857e501f43356036abe697f514f70a24
  Author: JeffH <jdhodges@google.com>
  Date:   2022-01-14 (Fri, 14 Jan 2022)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  minor editorial fixes