fix cargo doc error
@@ -69,8 +69,8 @@ pub trait Handler {
/// (or set in `accessed_addresses` / `accessed_storage_keys` via an access list
/// transaction).
/// References:
- /// * https://eips.ethereum.org/EIPS/eip-2929
- /// * https://eips.ethereum.org/EIPS/eip-2930
+ /// * <https://eips.ethereum.org/EIPS/eip-2929>
+ /// * <https://eips.ethereum.org/EIPS/eip-2930>
fn is_cold(&self, address: H160, index: Option<H256>) -> bool;
/// Set storage value of address at index.
