Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/liboperator.tex b/Doc/lib/liboperator.tex
index 812ca13..2169ea8 100644
--- a/Doc/lib/liboperator.tex
+++ b/Doc/lib/liboperator.tex
@@ -1,6 +1,6 @@
 % Contributed by Skip Montanaro, from the module's doc strings.
 
-\section{Built-in Module \sectcode{operator}}
+\section{Built-in Module \module{operator}}
 \label{module-operator}
 \bimodindex{operator}