[docs] [issue21034] Python docs reference the Distribute package which has been deprecated in favor of Setuptools

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe <tshepang at gmail.com>:


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nosy: +tshepang

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21034>
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