Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/mac/libctb.tex b/Doc/mac/libctb.tex
index de0636d..d7302be 100644
--- a/Doc/mac/libctb.tex
+++ b/Doc/mac/libctb.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{ctb}}
+\section{Built-in Module \module{ctb}}
 \label{module-ctb}
 \bimodindex{ctb}