[w3c/webauthn] 204da2: improve #936: existing linking lint (#944)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 204da2313c68f13b1baef9442733491c94fe58b2
      https://github.com/w3c/webauthn/commit/204da2313c68f13b1baef9442733491c94fe58b2
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-06-12 (Tue, 12 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  improve #936: existing linking lint (#944)

merging this editorial fixup PR...

* remove some dfn tags from section headers, improves issue #936

* tag occurances of 'verification procedure' improves issue #936

* un-dfn DAA improves #936

* un-dfn non-attstn fmt, improves #936

* Review of PR #944 (#945)

* Replace old <dfn>s with links

* Eliminate <dfn> for "No attestation statement"

Since its text never appears again in the document, change the one link
to it to point to <dfn>None</dfn> instead.

* Add link to "none" attestation statement format from None attestation type



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