Adjusted to use the new module synopsis support macros.
diff --git a/Doc/lib/libregsub.tex b/Doc/lib/libregsub.tex
index c390a49..0a75f36 100644
--- a/Doc/lib/libregsub.tex
+++ b/Doc/lib/libregsub.tex
@@ -1,6 +1,8 @@
\section{Standard Module \module{regsub}}
-\label{module-regsub}
-\stmodindex{regsub}
+\declaremodule{standard}{regsub}
+
+\modulesynopsis{Substitution and splitting operations that use regular expressions.}
+
This module defines a number of functions useful for working with
regular expressions (see built-in module \code{regex}).