chore: clean up some journalstate docs #4101

Job	Run time
check	18s
check no_std	18s
check serde	28s
clippy	1m 16s
check no_std optimism	23s
check std	16s
docs	1m 22s
fmt	8s
test stable --no-default-features	1m 1s
TyposCheck	4s
test stable	1m 6s
test stable --all-features	1m 28s
test beta --no-default-features	2m 21s
test beta	2m 26s
test beta --all-features	2m 39s
test nightly --no-default-features	2m 3s
test nightly	2m 18s
test nightly --all-features	2m 18s
	22m 13s

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