Fix double hyphen markup.
diff --git a/Doc/lib/libhtmlparser.tex b/Doc/lib/libhtmlparser.tex
index b6b8c98..3912653 100644
--- a/Doc/lib/libhtmlparser.tex
+++ b/Doc/lib/libhtmlparser.tex
@@ -109,9 +109,9 @@
\begin{methoddesc}{handle_comment}{data}
This method is called when a comment is encountered. The
\var{comment} argument is a string containing the text between the
-\samp{<!-\-} and \samp{-\->} delimiters, but not the delimiters
-themselves. For example, the comment \samp{<!--text-->} will cause
-this method to be called with the argument \code{'text'}. It is
+\samp{{-}{-}} and \samp{{-}{-}} delimiters, but not the delimiters
+themselves. For example, the comment \samp{<!{-}{-}text{-}{-}>} will
+cause this method to be called with the argument \code{'text'}. It is
intended to be overridden by a derived class; the base class
implementation does nothing.
\end{methoddesc}