[docs] [issue14879] invalid docs for subprocess exceptions with shell=True

[Chris Rebert]

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

Eh, just needs clarification along the lines of:

    "Exceptions raised in the child ++Python++ process"

    "A ValueError will be raised if Popen is called with invalid arguments
    ++whose validity is not dependent upon the state of the environment++."

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nosy: +cvrebert

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<http://bugs.python.org/issue14879>
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