Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libmailcap.tex b/Doc/lib/libmailcap.tex
index 52e2ee4..0ea762a 100644
--- a/Doc/lib/libmailcap.tex
+++ b/Doc/lib/libmailcap.tex
@@ -1,4 +1,4 @@
-\section{Standard Module \sectcode{mailcap}}
+\section{Standard Module \module{mailcap}}
 \label{module-mailcap}
 \stmodindex{mailcap}