chore: add comment for pub function and fix typo #4858

Job	Run time
check	22s
clippy	1m 23s
docs	1m 15s
check serde	29s
check no_std	33s
check no_std kzg-rs	33s
check std	30s
fmt	14s
TyposCheck	5s
test stable --no-default-features	34s
test stable	43s
test stable --all-features	59s
test beta --no-default-features	31s
test beta	34s
test beta --all-features	54s
test nightly --no-default-features	1m 33s
test nightly	1m 44s
test nightly --all-features	1m 48s
	14m 44s

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