[docs] [issue31567] Inconsistent documentation around decorators

[Daisuke Miyakawa]

Change by Daisuke Miyakawa <d.miyakawa at gmail.com>:


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keywords: +patch
pull_requests: +3935
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31567>
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