Document support for Markdown definition lists

[Google Code Exporter]

Pegdown and Gitiles has explicit support for definition lists.

These look like:

  Foo
  : Explanation of Foo

And render as:

  <dl>
    <dt>Foo</dt>
    <dd>Explanation of Foo</dd>
  </dl>

This is a useful feature since documentation occasionally involves specifying 
lists of definitions. However, I don't see any mention of this in the Gitiles 
Markdown documentation. Could that be added?

Original issue reported on code.google.com by [e-mail] on 30 Nov 2015 at 5:12