Add renaming notices to 2.6 dbm module docs.
diff --git a/Doc/library/whichdb.rst b/Doc/library/whichdb.rst
index 5c69818..7048a0e 100644
--- a/Doc/library/whichdb.rst
+++ b/Doc/library/whichdb.rst
@@ -1,10 +1,14 @@
-
:mod:`whichdb` --- Guess which DBM module created a database
============================================================
.. module:: whichdb
:synopsis: Guess which DBM-style module created a given database.
+.. note::
+ The :mod:`whichdb` module's only function has been put into the :mod:`dbm`
+ module in Python 3.0. The :term:`2to3` tool will automatically adapt imports
+ when converting your sources to 3.0.
+
The single function in this module attempts to guess which of the several simple
database modules available--\ :mod:`dbm`, :mod:`gdbm`, or :mod:`dbhash`\