New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/libposixpath.tex b/Doc/lib/libposixpath.tex
index 87c8010..83f468d 100644
--- a/Doc/lib/libposixpath.tex
+++ b/Doc/lib/libposixpath.tex
@@ -1,4 +1,5 @@
-\section{Standard Module \module{posixpath}}
+\section{\module{posixpath} ---
+         Common \POSIX{} pathname manipulations.}
 \declaremodule{standard}{posixpath}
 
 \modulesynopsis{Common \POSIX{} pathname manipulations.}