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

[Chris Rebert]

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

Well, the same basic example is used for cohesiveness, but the issue/pitfall being highlighted in each note is distinct. But you have a point about shlex being pointed out twice, so here's a version with that redundancy excised.

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Added file: http://bugs.python.org/file16098/subprocess.rst.patch

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