[docs] [issue15269] Document dircmp.left and dircmp.right

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Yes, code samples would help clarifying the rationale for this request

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nosy: +eli.bendersky
versions: +Python 3.4 -Python 3.3

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<http://bugs.python.org/issue15269>
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