title: doxygen markdown prevent syntax highlighting in fenced code block
body: <p>I want a fenced code block to appear without any syntax highlighting. For the following code:</p>
  
  <pre><code>~~~
  Behold this, for this is an orange.
  ~~~
  </code></pre>
  
  <p>I get <code>for</code> and <code>this</code> in color. Notice I have not specified the file extension. Do I need to specify a specific extension? I tried with <code>{.txt}</code>, but that didn't help. </p>