[issue41411] Improve and consolidate f-strings docs

[Guido van Rossum]

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

Note that there already is something in the tutorial about f-strings (in
inputoutput.rst, labeled tut-f-strings), and the intro has a link to their
reference manual description in the "see also" section.

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