[issue6159] Tkinter.PanedWindow: docstring fixes, change in paneconfigure and removed some returns

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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versions: +Python 3.3, Python 3.4 -Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6159>
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