Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libstruct.tex b/Doc/lib/libstruct.tex
index b92076c..5703c05 100644
--- a/Doc/lib/libstruct.tex
+++ b/Doc/lib/libstruct.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{struct}}
+\section{Built-in Module \module{struct}}
 \label{module-struct}
 \bimodindex{struct}
 \indexii{C@\C{}}{structures}