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

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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keywords: +easy
nosy: +ezio.melotti
stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18576>
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