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I agree it's useful info :)
I went ahead and made a PR \[1\].
In my PR, I simply linked to the Format Specification Mini Language\[2\] from f-strings documentation\[3\].
Not sure about updating PEP 498 at this point..
\[1\]
https://github.com/python/
cpython/pull/4888
\[2\]
https://docs.python.org/3.
6/library/string.html#format-s
pecification-mini-language
\[3\]
https://docs.python.org/3/
reference/lexical\_analysis.htm
l#f-strings