add a note about the undocumented bsddb185 module

Doc/lib/libbsddb.tex

@@ -86,6 +86,12 @@ interpretation.
   \seemodule{dbhash}{DBM-style interface to the \module{bsddb}}
 \end{seealso}
 
+\begin{notice}
+Beginning in 2.3 some Unix versions of Python may have a \module{bsddb185}
+module.  This is present \emph{only} to allow backwards compatibility with
+systems which ship with the old Berkeley DB 1.85 database library.  The
+\module{bsddb185} module should never be used directly in new code.
+\end{notice}
 
 \subsection{Hash, BTree and Record Objects \label{bsddb-objects}}
 

Doc/lib/libundoc.tex

@@ -62,6 +62,12 @@ OS/2 platforms.
 --- Implementation on \module{os.path} on \POSIX.
 \end{description}
 
+\item[\module{bsddb185}]
+--- Backwards compatibility module for systems which still use the Berkeley
+DB 1.85 module.  It is normally only available on certain BSD Unix-based
+systems.  It should never be used directly.
+\end{description}
+
 
 \section{Multimedia}