[docs] [issue35732] Typo in library/warnings documentation

[Antoine Wecxsteen]

Change by Antoine Wecxsteen <antoine at wecxsteen.net>:


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keywords: +patch, patch, patch, patch
pull_requests: +11171, 11172, 11173, 11174
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35732>
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