Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libgrp.tex b/Doc/lib/libgrp.tex
index da66800..551171b 100644
--- a/Doc/lib/libgrp.tex
+++ b/Doc/lib/libgrp.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{grp}}
+\section{Built-in Module \module{grp}}
 \label{module-grp}
 
 \bimodindex{grp}