[docs] [issue18576] Document test.support.script_helper

[Christie]

Christie added the comment:

Hey @vadmium!

I've finally responded to your review feedback. I've attached a new patch, hopefully this time actually review-able. I've removed the docs for methods I added in @24033 so that this could be merged without it.

Let me know if you have any more feedback, or if this could be merged.

Thanks!

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Added file: http://bugs.python.org/file39827/issue18576.patch

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