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

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

If you want to modify the text, please create a PR for this file: https://github.com/python/cpython/blob/master/Doc/reference/datamodel.rst#metaclasses

Don't forget to sign the CLA, 

Thank you

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