[w3c/webauthn] aee0c0: Refine makeCredential description (#369)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: aee0c081ff073637a67070cb4463877601181aba
      https://github.com/w3c/webauthn/commit/aee0c081ff073637a67070cb4463877601181aba
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2017-03-03 (Fri, 03 Mar 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Refine makeCredential description (#369)

* Refine makeCredential description

As per my comments on #347

* Incorporate feedback from JeffH, part 1

* Incorporate feedback from JeffH, part 2

Use "client data" and "authenticator data" instead of "ClientData" and
"authenticatorData".

* Incorporate feedback from JeffH, part 3

Tag all instances of "client data", "authenticator data" and
"attestation data".