Remove all uses of \sectcode; we can now use logical markup everywhere.
diff --git a/Doc/lib/librexec.tex b/Doc/lib/librexec.tex
index 03e8284..baddece 100644
--- a/Doc/lib/librexec.tex
+++ b/Doc/lib/librexec.tex
@@ -1,4 +1,4 @@
-\section{Standard Module \sectcode{rexec}}
+\section{Standard Module \module{rexec}}
 \label{module-rexec}
 \stmodindex{rexec}