Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/libsocket.tex b/Doc/libsocket.tex
index 030eb72..76d2b1a 100644
--- a/Doc/libsocket.tex
+++ b/Doc/libsocket.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{socket}}
+\section{Built-in Module \module{socket}}
 \label{module-socket}
 \bimodindex{socket}