Consider marking PEP 570 Final

[CAM-Gerlach]

@iritkatriel brought up on python/docs-community#42 that BPO-21341 is still open, which mentions that PEP 570 (PEP-0570), positional-only parameters, is not yet marked Final despite being implemented and released (as of three years ago). It also seems the language spec was updated to mention it, linking to the PEP for the details (as do other features) and there's an FAQ entry describing it.

Given that, can this be marked final? Is there anywhere else that should be updated, and is there any other PEP content that should be migrated to a canonical location in the Python documentation?

@larryhastings @pablogsal @mariocj89 @ericvw

[brettcannon]

It's very likely just an oversight that someone forgot to update the PEP as final.

[pablogsal]

Yeah, indeed is an oversight. I can mark it as final if nobody does it before :)

[CAM-Gerlach]

@pablogsal didn't see your comment before I opened #2481 , sorry. Feel free to merge that, or push the change yourself, at your option. Thanks!