autodocs for enums generate crazy output

[ojii]

see https://aiodynamo.readthedocs.io/en/latest/usage.html#aiodynamo.models.ReturnValues

[dimaqq]

Here's what we do:

https://github.com/canonical/operator/blob/449793f9867eba11dc2e7e1c28ea3dca1e1da231/ops/pebble.py#L1507-L1537

And here's the output

https://ops.readthedocs.io/en/latest/#ops.pebble.ChangeStatus

[ojii]

I don't want this part: (value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None), it's super confusing