Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libsgmllib.tex b/Doc/lib/libsgmllib.tex
index f86e729..f086b4b 100644
--- a/Doc/lib/libsgmllib.tex
+++ b/Doc/lib/libsgmllib.tex
@@ -1,4 +1,4 @@
-\section{Standard Module \sectcode{sgmllib}}
+\section{Standard Module \module{sgmllib}}
 \label{module-sgmllib}
 \stmodindex{sgmllib}
 \index{SGML}