[w3c/webauthn] f3e6ad: editorial cleanups (#185)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: f3e6ad2b553c0bc29b8943e76651a8be938454e4
      https://github.com/w3c/webauthn/commit/f3e6ad2b553c0bc29b8943e76651a8be938454e4
  Author: =JeffH <Jeff.Hodges@KingsMountain.com>
  Date:   2016-09-01 (Thu, 01 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  editorial cleanups (#185)

* clarify optionality of FIDO MDS.  Fixes #47.

* ref to {#sec-attestation-privacy} section. fixes #100.

* clarify 'algorithm member' language. Fixes #113.

* normalizing indents for markdown, and also line lengths

* fix xref

* incorp feedback from @vijaybh, thanks!