Adjusted to use the new module synopsis support macros.
diff --git a/Doc/lib/libmpz.tex b/Doc/lib/libmpz.tex
index 707a3a8..98f09a8 100644
--- a/Doc/lib/libmpz.tex
+++ b/Doc/lib/libmpz.tex
@@ -1,6 +1,8 @@
\section{Built-in Module \module{mpz}}
-\label{module-mpz}
-\bimodindex{mpz}
+\declaremodule{builtin}{mpz}
+
+\modulesynopsis{Interface to the GNU MP library for arbitrary precision arithmetic.}
+
This is an optional module. It is only available when Python is
configured to include it, which requires that the GNU MP software is