[docs] [issue35992] Metaclasses interfere with __class_getitem__

[Ivan Levkivskyi]

Change by Ivan Levkivskyi <levkivskyi at gmail.com>:


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keywords: +patch
pull_requests: +11889
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35992>
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