I think we can remove the three warnings from the top of https://pillow.readthedocs.io/en/stable/installation.html

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Pillow and PIL cannot co-exist in the same environment. Before installing Pillow, please uninstall PIL.

I seem to remember that around ten years ago, it used to be possible to install PIL from PyPI.

It used to be that PyPI would allow installing files hosted elsewhere, but now all files must be uploaded to PyPI, and there are no downloadable files at https://pypi.org/project/PIL/.

I don't think it's possible now to install PIL and Pillow at the same time, even if you tried installing PIL from source.

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Pillow >= 1.0 no longer supports import Image. Please use from PIL import Image instead.

https://pypi.org/project/pillow/1.0/ was released in 2010. I don't think we need to warn about this any more.

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Pillow >= 2.1.0 no longer supports import _imaging. Please use from PIL.Image import core as _imaging instead.

https://pypi.org/project/pillow/2.1.0/ was released in 2013. I don't think we need to warn about this either.