title: How to include ASCII art/diagrams in Rust source-code comment documentation?
body: <p>How should Markdown be used with rustdoc to include diagrams or ASCII art?</p>
  
  <p>From reading the manual, triple back-ticks can be used for code-snippets.
  How do I include literal, non-formatted text?</p>
  
  <p><em>(Something like <a href="http://en.wikipedia.org/wiki/Doxygen" rel="noreferrer">Doxygen's</a> <code>&lt;pre&gt;...&lt;/pre&gt;</code>)</em></p>