New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/libmailcap.tex b/Doc/lib/libmailcap.tex
index 8c8b705..e6c5396 100644
--- a/Doc/lib/libmailcap.tex
+++ b/Doc/lib/libmailcap.tex
@@ -1,4 +1,5 @@
-\section{Standard Module \module{mailcap}}
+\section{\module{mailcap} ---
+         Mailcap file handling.}
 \declaremodule{standard}{mailcap}
 
 \modulesynopsis{Mailcap file handling.}