[docs] [issue34768] Add documentation explaining __init__.py in packages

[Benito Kestelman]

Change by Benito Kestelman <beni.kestel001 at gmail.com>:


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title: Add documentation for the purpose of __init__.py in packages -> Add documentation explaining __init__.py in packages

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34768>
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