New section header style.

Fix up a few synopses.
diff --git a/Doc/lib/librexec.tex b/Doc/lib/librexec.tex
index 8881c93..a7e8913 100644
--- a/Doc/lib/librexec.tex
+++ b/Doc/lib/librexec.tex
@@ -1,4 +1,5 @@
-\section{Standard Module \module{rexec}}
+\section{\module{rexec} ---
+         Basic restricted execution framework.}
 \declaremodule{standard}{rexec}
 
 \modulesynopsis{Basic restricted execution framework.}