New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/libregex.tex b/Doc/lib/libregex.tex
index 253d50b..ffe959a 100644
--- a/Doc/lib/libregex.tex
+++ b/Doc/lib/libregex.tex
@@ -1,4 +1,5 @@
-\section{Built-in Module \module{regex}}
+\section{\module{regex} ---
+         Regular expression search and match operations.}
 \declaremodule{builtin}{regex}
 
 \modulesynopsis{Regular expression search and match operations.}