Fix typos and make block hash calculation public #15402

Job	Run time
target-branch-check	1s
release-tests-windows	26m 35s
release-tests-ubuntu	26m 49s
beacon-chain-tests	18m 42s
check-code	8m 34s
cargo-udeps	7m 0s
check-msrv	4m 33s
cli-check	8m 49s
compile-with-beta-compiler	13m 13s
debug-tests-ubuntu	9m 45s
dockerfile-ubuntu	13m 18s
doppelganger-protection-test	22m 38s
ef-tests-ubuntu	14m 40s
eth1-simulator-ubuntu	20m 8s
execution-engine-integration-ubuntu	17m 21s
merge-transition-ubuntu	20m 18s
network-tests	8m 21s
no-eth1-simulator-ubuntu	18m 38s
op-pool-tests	12m 6s
slasher-tests	1m 18s
state-transition-vectors-ubuntu	2m 28s
syncing-simulator-ubuntu	13m 14s
test-suite-success	3s
	4h 48m 32s

Provide feedback