[docs] [issue18578] Rename and document test.bytecode_helper as test.support.bytecode_helper

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

@seydou, would you be interested in making a GitHub pull request for your patch?

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assignee:  -> docs at python
components: +Documentation, Tests
nosy: +cheryl.sabella, docs at python
stage:  -> needs patch
type:  -> enhancement
versions: +Python 3.8 -Python 3.4

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<https://bugs.python.org/issue18578>
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