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

[Nick Coghlan]

Nick Coghlan added the comment:

I wouldn't worry about 3.3 at this point - the 3.3 test suite isn't going to see major changes for its final release, so the risk of merge conflicts is low.

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versions:  -Python 3.3

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