Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libfcntl.tex b/Doc/lib/libfcntl.tex
index 6811008..1c64af9 100644
--- a/Doc/lib/libfcntl.tex
+++ b/Doc/lib/libfcntl.tex
@@ -1,5 +1,5 @@
 % Manual text by Jaap Vermeulen
-\section{Built-in Module \sectcode{fcntl}}
+\section{Built-in Module \module{fcntl}}
 \label{module-fcntl}
 \bimodindex{fcntl}
 \indexii{UNIX@\UNIX{}}{file control}