bpo-47007: [doc] str special method lookup

[itsvs]

Adds a note to the str() docs pointing out that object.__str__() follows special method lookup.

https://bugs.python.org/issue47007

https://bugs.python.org/issue47007

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[JelleZijlstra]

This seems excessively long to me. I'd prefer just saying type(object).__str__(object), as the bug suggested.

[itsvs]

sure, changed to just type(object).__str__(object) (do these docs prefer the 80-character cutoff? i didn't reformat)

[miss-islington]

Thanks @itsvs for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9, 3.10.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[bedevere-bot]

GH-32318 is a backport of this pull request to the 3.10 branch.

[bedevere-bot]

GH-32319 is a backport of this pull request to the 3.9 branch.