I'm trying to embed YAML output in a simple markup file (not a ruby code 
file) that gets fed into RDoc. I want the YAML text to show up as a 
literal. So I indent. For instance:

   ---
   foo:
     :bar: 3

The problem is that the :bar: causes RDoc to complain about an 
"Unrecognized directive".

How can I quote this text so that RDoc doesn't look for directives? I've 
tried various combinations of <tt>, blackslashes, :enddoc:.