Update Tkinter3000 notes based on text from Fredrik Lundh.

Doc/lib/tkinter.tex

@@ -1781,13 +1781,15 @@ translations from the itcl to Python. It offers most of the range of
 widgets that \code{[incr Widgets]} does, and is almost as complete as
 Tix, lacking however Tix's fast \class{HList} widget for drawing trees.
 }
-\seetitle[http://tkinter.effbot.org]{Tkinter3000}{
-is a Widget Construction Kit that allows you to write new Tkinter
-widgets in Python using Mixins. It is built on top of Tkinter,
-and does not offer the extended range of widgets that \refmodule{Tix} does,
-but does allow a form of  building mega-widgets. The project is
-still in the early stages.
-}
+
+\seetitle[http://tkinter.effbot.org/]{Tkinter3000 Widget Construction
+          Kit (WCK)}{%
+is a library that allows you to write new Tkinter widgets in pure
+Python.  The WCK framework gives you full control over widget
+creation, configuration, screen appearance, and event handling.  WCK
+widgets can be very fast and light-weight, since they can operate
+directly on Python data structures, without having to transfer data
+through the Tk/Tcl layer.}
 \end{seealso*}