[w3c/webauthn] 427c7e: Un-hardcode list item numbers

  Branch: refs/heads/unhardcode-list-numbers
  Home:   https://github.com/w3c/webauthn
  Commit: 427c7eb63f8b125c875aa7e080b05a997dd3c02e
      https://github.com/w3c/webauthn/commit/427c7eb63f8b125c875aa7e080b05a997dd3c02e
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-01-22 (Mon, 22 Jan 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Un-hardcode list item numbers

Except for two cases where the preceding text explicitly states that the
list has two elements.