Confusing note in plugin documentation

[David-Baddeley]

Issue Description

I found the note

"Since this specification is part of the standard library, most packaging tools other than setuptools provide support for defining entry points."

at the end of https://packaging.python.org/en/latest/guides/creating-and-discovering-plugins/ confusing, as it implies that setuptools does not support entry points. My immediate reaction to reading this was that I can't use entry points with setuptools until I remembered that setuptools more or less invented the concept.

Code of Conduct

• I am aware that participants in this repository must follow the PSF Code of Conduct.

[webknjaz]

It's possible that said phrase was written by a non-native 🤷‍♂️
FWIW, setuptools' invention was pkg_resources with a slow file tree scan, IIRC. Or was it distutils? 🤔

Anyway, I think nobody here would oppose a little rephrasing. This sounds justified. Feel free to send a PR saying "it's not just setuptools anymore" or something like that.

cc @jaraco @ncoghlan plz advise on the native speech vibe 🙏