Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/libos.tex b/Doc/libos.tex
index 953e117..810e40c 100644
--- a/Doc/libos.tex
+++ b/Doc/libos.tex
@@ -1,4 +1,4 @@
-\section{Standard Module \sectcode{os}}
+\section{Standard Module \module{os}}
 \label{module-os}
 \stmodindex{os}