New section header style.
Fix up a few synopses.
diff --git a/Doc/lib/libmpz.tex b/Doc/lib/libmpz.tex
index 98f09a8..c761ea1 100644
--- a/Doc/lib/libmpz.tex
+++ b/Doc/lib/libmpz.tex
@@ -1,7 +1,9 @@
-\section{Built-in Module \module{mpz}}
+\section{\module{mpz} ---
+ GNU MP library for arbitrary precision arithmetic.}
\declaremodule{builtin}{mpz}
-\modulesynopsis{Interface to the GNU MP library for arbitrary precision arithmetic.}
+\modulesynopsis{Interface to the GNU MP library for arbitrary
+precision arithmetic.}
This is an optional module. It is only available when Python is