Add comment about requested LaTeXML feature being marked as fixed

MLS.tex

@@ -24,6 +24,17 @@
 \addbibresource{mls.bib}
 \fi
 
+% When debugging the LaTeXML build, it would be good to know the LaTeXML version used.
+% The need for this feature has been reported as:
+% - https://github.com/brucemiller/LaTeXML/issues/2033 -- fixed on 'master'
+% When the fix becomes available in the LaTeXML version we use, try enabling the following:
+%\usepackage{latexml}
+%\iflatexml%
+%\begin{lxFooter}
+%Produced by \LaTeXMLfullversion.
+%\end{lxFooter}%
+%\fi
+
 \begin{document}
 
 % Setting pageanchor false for these unnumbered pages