chore: fix some typos #4340

Job	Run time
clippy	1m 16s
check no_std	23s
check	17s
check no_std kzg-rs	25s
check serde	22s
docs	1m 30s
check std	19s
fmt	7s
TyposCheck	6s
test stable --no-default-features	56s
test stable	47s
test stable --all-features	1m 13s
test beta --no-default-features	53s
test beta	55s
test beta --all-features	1m 9s
test nightly --no-default-features	1m 22s
test nightly	48s
test nightly --all-features	1m 10s
	13m 58s

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