PEP 639, Round 2: Improving license clarity with better package metadata

[brettcannon]

@CAM-Gerlach

At long last, the next (and hopefully final) round of substantive PEP 639 updates is up for editorial review!

@CAM-Gerlach

Once that’s reviewed and merged, I’ll have a final followup PR that will shorten the total PEP length by around a further two thirds

So should I wait for the 3rd round, or did you need my specific input on the current PR?