[issue6760] patch to subprocess docs to better explain Popen's 'args' argument

[Chris Rebert]

Changes by Chris Rebert <pybugs at rebertia.com>:


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versions: +Python 3.1, Python 3.2
Added file: http://bugs.python.org/file14817/subprocess.rst.patch

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<http://bugs.python.org/issue6760>
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