[docs] [issue18576] Rename and document test.script_helper as test.support.script_helper

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Does the last patch meet your expectations, or would you rather see all these changes implemented at once?

I left this for Nick.

I have added comments on Rietveld.

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stage: needs patch -> patch review

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<http://bugs.python.org/issue18576>
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