Minor fix in documentation of code module.
(Clarifies output destination for default implementation of the write()
method.)
\end{methoddesc}
\begin{methoddesc}{write}{data}
-Write a string to standard output. Derived classes should override
-this to provide the appropriate output handling as needed.
+Write a string to the standard error stream (\code{sys.stderr}).
+Derived classes should override this to provide the appropriate output
+handling as needed.
\end{methoddesc}