[w3c/webauthn] 5300df: Replace <pre class="idl">s with <xmp>s

  Branch: refs/heads/issue-943-pre-xmp
  Home:   https://github.com/w3c/webauthn
  Commit: 5300df31baab4b7bd792365caf22dc218aefedfd
      https://github.com/w3c/webauthn/commit/5300df31baab4b7bd792365caf22dc218aefedfd
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-06-13 (Wed, 13 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Replace <pre class="idl">s with <xmp>s

This fixes #943.



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