[w3c/webauthn] 03cf32: Proofreading fixes, finish attestation cleanup

  Branch: refs/heads/vgb-u2f-attestation
  Home:   https://github.com/w3c/webauthn
  Commit: 03cf32732adf73bed9c1bcb2dc3ed19b234817ae
      https://github.com/w3c/webauthn/commit/03cf32732adf73bed9c1bcb2dc3ed19b234817ae
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2017-01-11 (Wed, 11 Jan 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Proofreading fixes, finish attestation cleanup

Fixed small wording and markdown issues. This completes the changes to
make attestation opaque to UAs, which fixes #286, fixes #287, and fixes
#289. It also fixes #239 by removing the homegrown algorithm identifiers
and specifying the algorithm explicitly in attestation data using JWK
identifiers. It also fixes #240 by encoding keys in CBOR which specifies
lengths of fields.