Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/libimp.tex b/Doc/libimp.tex
index 5664c81..7d4f8d1 100644
--- a/Doc/libimp.tex
+++ b/Doc/libimp.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{imp}}
+\section{Built-in Module \module{imp}}
 \label{module-imp}
 \bimodindex{imp}
 \index{import}