`Itertools::format[_with]` docs mention panic within logging macro #1020

Job	Run time
doc	14s
check format	11s
check	35s
miri	3m 26s
msrv	23s
semver-checks	11s
check (--no-default-features)	5s
check (--no-default-features --features use_alloc)	9s
test	51s
check (--all-targets --all-features)	22s
All checks succeeded	1s
	6m 28s

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