[w3c/webauthn] 61bc86: Put Signature formats in its own section

  Branch: refs/heads/akshay-sig-clarification
  Home:   https://github.com/w3c/webauthn
  Commit: 61bc8633eb2b6f8c7c27bc259afef323ec9d57f7
      https://github.com/w3c/webauthn/commit/61bc8633eb2b6f8c7c27bc259afef323ec9d57f7
  Author: Akshay Kumar <akshayku@corp.microsoft.com>
  Date:   2018-02-16 (Fri, 16 Feb 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Put Signature formats in its own section