[docs] [issue20467] Confusing wording about __init__

[Ethan Furman]

Ethan Furman added the comment:

Changed 'no value may be returned' to 'no non-None value may be returned'.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20467>
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