Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/libbltin.tex b/Doc/lib/libbltin.tex
index 7413093..a4a0dd0 100644
--- a/Doc/lib/libbltin.tex
+++ b/Doc/lib/libbltin.tex
@@ -1,4 +1,4 @@
-\section{Built-in Module \sectcode{__builtin__}}
+\section{Built-in Module \module{__builtin__}}
 \label{module-builtin}
 \bimodindex{__builtin__}