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

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

Gonna have to disagree about the raw_input(), because the escaping involved would complicate the example and could be distracting/confusing.
Rest of Brian's suggestions taken into account.

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Added file: http://bugs.python.org/file16095/subprocess.rst.patch

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