[docs] [issue22997] Minor improvements to "Functional API" section of Enum documentation

[Ethan Furman]

Ethan Furman added the comment:

Simeon, the patch looks decent; I'll review it more carefully later.

If you are going to contribute non-trivial patches, you'll need to sign the CLA:  https://www.python.org/psf/contrib/contrib-form/ .

Thanks for helping!

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