[issue19897] Use python as executable instead of python3 in Python 2 docs

[Roundup Robot]

New submission from Roundup Robot:

New changeset eb0921b2100b by Berker Peksag in branch '2.7':
Issue #19897: Use python as executable instead of python3.
http://hg.python.org/cpython/rev/eb0921b2100b

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19897>
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