[docs] [issue30136] Add test.support.script_helper to documentation

[Louie Lu]

New submission from Louie Lu:

`test.support.script_helper` didn't document at `test` document.

It should be add on.

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assignee: docs at python
components: Documentation
messages: 292103
nosy: docs at python, louielu
priority: normal
severity: normal
status: open
title: Add test.support.script_helper to documentation
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30136>
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