New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/libcrypt.tex b/Doc/lib/libcrypt.tex
index 418b9d5..1702324 100644
--- a/Doc/lib/libcrypt.tex
+++ b/Doc/lib/libcrypt.tex
@@ -1,4 +1,5 @@
-\section{Built-in Module \module{crypt}}
+\section{\module{crypt} ---
+         The \cfunction{crypt()} function used to check \UNIX{} passwords.}
 \declaremodule{builtin}{crypt}
 
 \modulesynopsis{The \cfunction{crypt()} function used to check \UNIX{} passwords.}