Changed \indexsubitem from ({\tt XMLParser} method) to just (XMLParser method).

This makes it more consistent with other modules.  All three *mllib modules
need this change.
diff --git a/Doc/lib/libxmllib.tex b/Doc/lib/libxmllib.tex
index d75d121..b9897a0 100644
--- a/Doc/lib/libxmllib.tex
+++ b/Doc/lib/libxmllib.tex
@@ -10,7 +10,7 @@
 The \code{XMLParser} class must be instantiated without arguments.  It 
 has the following interface methods:
 
-\renewcommand{\indexsubitem}{({\tt XMLParser} method)}
+\renewcommand{\indexsubitem}{(XMLParser method)}
 
 \begin{funcdesc}{reset}{}
 Reset the instance.  Loses all unprocessed data.  This is called