[docs] [issue24998] docs: subprocess.Popen example has extra/invalid parameter

[eryksun]

Changes by eryksun <eryksun at gmail.com>:


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keywords: +easy
priority: normal -> low
versions: +Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24998>
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