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

[Chris Rebert]

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

Counterpatch incorporating R. David Murray's succinctness improvements while retaining correct positioning of the first note, managing to incorporate the 3rd note not present in Mr. Murray's, and including more precise wording to address the problem Eric Smith pointed out.

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Added file: http://bugs.python.org/file16101/subprocess.rst.patch

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