Change \sectcode to logical markup.
diff --git a/Doc/ext/ext.tex b/Doc/ext/ext.tex
index 787914e..fc56a80 100644
--- a/Doc/ext/ext.tex
+++ b/Doc/ext/ext.tex
@@ -557,7 +557,7 @@
memory, and this should be checked.
-\section{Format Strings for \sectcode{PyArg_ParseTuple()}}
+\section{Format Strings for \cfunction{PyArg_ParseTuple()}}
\label{parseTuple}
The \cfunction{PyArg_ParseTuple()} function is declared as follows:
@@ -763,7 +763,7 @@
\end{verbatim}
-\section{Keyword Parsing with \sectcode{PyArg_ParseTupleAndKeywords()}}
+\section{Keyword Parsing with \cfunction{PyArg_ParseTupleAndKeywords()}}
\label{parseTupleAndKeywords}
The \cfunction{PyArg_ParseTupleAndKeywords()} function is declared as
@@ -833,7 +833,7 @@
\end{verbatim}
-\section{The \sectcode{Py_BuildValue()} Function}
+\section{The \cfunction{Py_BuildValue()} Function}
\label{buildValue}
This function is the counterpart to \cfunction{PyArg_ParseTuple()}. It is