[issue36947] [Good first issue] Fix 3.3.3.1 Metaclasses Documentation

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +15037
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15319

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