gh-122767: document "new style" formatting for complexes

[skirpichev]

• Issue: gh-122767

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📚 Documentation preview 📚: https://cpython-previews--122848.org.readthedocs.build/

[bedevere-app[bot]]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[skirpichev]

I have made the requested changes; please review again.

[bedevere-app[bot]]

Thanks for making the requested changes!

@ericvsmith: please review the changes made to this pull request.

[bedevere-app[bot]]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

And if you don't make the requested changes, you will be poked with soft cushions!

[skirpichev]

I have made the requested changes; please review again.

[bedevere-app[bot]]

Thanks for making the requested changes!

@ericvsmith: please review the changes made to this pull request.

[skirpichev]

CC @ericvsmith, are you waiting for the second opinion? (BTW, I'm ok above suggestion by @picnixz)

[miss-islington-app[bot]]

Thanks @skirpichev for the PR, and @encukou for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13. 🐍🍒⛏🤖

[bedevere-app[bot]]

GH-126128 is a backport of this pull request to the 3.13 branch.

[bedevere-app[bot]]

GH-126129 is a backport of this pull request to the 3.12 branch.