[docs] [issue37789] Update doc strings for test.bytecode_helper

[Joannah Nanjekye]

Change by Joannah Nanjekye <nanjekyejoannah at gmail.com>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python
versions: +Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37789>
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