[w3c/webauthn] f5a384: use spaces to indent second enum value

  Branch: refs/heads/credential-type-uaf
  Home:   https://github.com/w3c/webauthn
  Commit: f5a38484fbc0989016f093affd91acf5eada8ff8
      https://github.com/w3c/webauthn/commit/f5a38484fbc0989016f093affd91acf5eada8ff8
  Author: rlin1 <rolf@noknok.com>
  Date:   2017-05-29 (Mon, 29 May 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  use spaces to indent second enum value