Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
index 266454f..49eb62e 100644
--- a/Doc/lib/libsignal.tex
+++ b/Doc/lib/libsignal.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{signal}}
+\section{Built-in Module \module{signal}}
 \label{module-signal}
 
 \bimodindex{signal}