Fixed description of WSTOPSIG(), added WTERMSIG().  Problem reported
by Jonathan Giddy <jon@dgs.monash.edu.au>.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index c6f74f5..a03a7bf 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -758,6 +758,11 @@
 \end{funcdesc}
 
 \begin{funcdesc}{WSTOPSIG}{status}
+Return the signal which caused the process to stop.
+Availability: \UNIX{}.
+\end{funcdesc}
+
+\begin{funcdesc}{WTERMSIG}{status}
 Return the signal which caused the process to exit.
 Availability: \UNIX{}.
 \end{funcdesc}