Fix typos and make block hash calculation public (#5275)

* Fix typo in `verify_payload_block_hash`

* Make calculate_execution_block_hash public again

beacon_node/execution_layer/src/lib.rs

@@ -7,6 +7,7 @@
 use crate::payload_cache::PayloadCache;
 use arc_swap::ArcSwapOption;
 use auth::{strip_prefix, Auth, JwtKey};
+pub use block_hash::calculate_execution_block_hash;
 use builder_client::BuilderHttpClient;
 pub use engine_api::EngineCapabilities;
 use engine_api::Error as ApiError;