Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libcmath.tex b/Doc/lib/libcmath.tex
index ae50743..adce12f 100644
--- a/Doc/lib/libcmath.tex
+++ b/Doc/lib/libcmath.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{cmath}}
+\section{Built-in Module \module{cmath}}
 \label{module-cmath}
 
 \bimodindex{cmath}