Fix a couple of minor markup glitches.

Doc/whatsnew/whatsnew23.tex

@@ -969,8 +969,8 @@ patch had undergone a lengthy review.  After it was checked in, Guido
 van~Rossum rewrote parts of it.  This is a good example of the free
 software development process in action.
 
-\item The value of the C \cfunction{PYTHON_API_VERSION} macro is now exposed 
-at the Python level as \constant{sys.api_version}.
+\item The value of the C \constant{PYTHON_API_VERSION} macro is now exposed 
+at the Python level as \code{sys.api_version}.
 
 \item The new \module{textwrap} module contains functions for wrapping
 strings containing paragraphs of text.  The \function{wrap(\var{text},