Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/mac/libmactcp.tex b/Doc/mac/libmactcp.tex
index 790c48e..b592247 100644
--- a/Doc/mac/libmactcp.tex
+++ b/Doc/mac/libmactcp.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{mactcp}}
+\section{Built-in Module \module{mactcp}}
 \label{module-mactcp}
 \bimodindex{mactcp}