New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/libgl.tex b/Doc/lib/libgl.tex
index 6824418..6940437 100644
--- a/Doc/lib/libgl.tex
+++ b/Doc/lib/libgl.tex
@@ -1,4 +1,5 @@
-\section{Built-in Module \module{gl}}
+\section{\module{gl} ---
+         Functions from the Silicon Graphics \emph{Graphics Library}.}
 \declaremodule{builtin}{gl}
 
 \modulesynopsis{Functions from the Silicon Graphics \emph{Graphics Library}.}
@@ -185,7 +186,8 @@
 main()
 \end{verbatim}
 %
-\section{Standard Module \module{DEVICE}}
+\section{\module{DEVICE} ---
+         Constants used with the \module{gl} module.}
 \declaremodule{standard}{DEVICE}
 
 \modulesynopsis{Constants used with the \module{gl} module.}
@@ -196,7 +198,8 @@
 Read the module source file for details.
 
 
-\section{Standard Module \module{GL}}
+\section{\module{GL} ---
+         Constants used with the \module{gl} module.}
 \declaremodule{standard}{GL}
 
 \modulesynopsis{Constants used with the \module{gl} module.}