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

[Nick Coghlan]

Nick Coghlan added the comment:

script_helper was moved to the test.support package in issue 9517, so this issue is just about adding the docs now.

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dependencies: +Make test.script_helper more comprehensive, and use it in the test suite -Refactor the test_runpy walk_package support code into a common location
title: Rename and document test.script_helper as test.support.script_helper -> Document test.support.script_helper
versions: +Python 3.5 -Python 3.4

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