Add comments about LaTeXML issue 1292 being fixed on 'master'

LaTeXML issue: brucemiller/LaTeXML#1292
LaTeXML fix: brucemiller/LaTeXML@9f5c893

chapters/synchronous.tex

@@ -185,7 +185,7 @@ \section{Definitions}\doublelabel{definitions}
 \subsection{Clocks and Clocked Variables}\doublelabel{clocks-and-clocked-variables}
 
 % We can't use \subfloat just yet due to LaTeXML issue:
-%   https://github.com/brucemiller/LaTeXML/issues/1292
+%   https://github.com/brucemiller/LaTeXML/issues/1292 (marked as fixed as of commit 9f5c893b)
 %\begin{figure}[tb]
 %  \centering
 %  \subfloat[A piecewise-constant variable.]{\includegraphics[width=5cm]{piecewise}\doublelabel{fig:piecewise-constant-variable}}

preamble.tex

@@ -40,7 +40,7 @@
 \def\figureautorefname{figure} % Use lower case initial, just like for sections.
 
 % Don't use subfig.sty until this LaTeXML issue has been fixed:
-% - https://github.com/brucemiller/LaTeXML/issues/1292
+% - https://github.com/brucemiller/LaTeXML/issues/1292 (marked as fixed as of commit 9f5c893b)
 % Leaving commented-out code as a hint to anyone who considers using subfig.
 %\usepackage{subfig}
 %\newcommand{\subfigureautorefname}{\figureautorefname}