[issue41411] Improve and consolidate f-strings docs

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

@ezio.melotti: What is this waiting for at this point? There was some good energy here but progress seems halted, waiting for some kind of decision.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41411>
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