[cl-markdown-devel] minor backtick bug

According to http://daringfireball.net/projects/markdown/syntax#code "" A single backtick in a code span: `` ` `` A backtick-delimited string in a code span: `` `foo` `` will produce: <p>A single backtick in a code span: <code>`</code></p> <p>A backtick-delimited string in a code span: <code>`foo`</code></p> "" cl-markdown produces <code></code> <code>foo</code> <code></code>... Not important now, I worked around it; just wanted to record the issue. - Daniel