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.html#f-strings
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