chore: add link to SHA256 article (#16129)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/net/ecies/src/util.rs

@@ -4,7 +4,7 @@ use alloy_primitives::B256;
 use hmac::{Hmac, Mac};
 use sha2::{Digest, Sha256};
 
-/// Hashes the input data with SHA256.
+/// Hashes the input data with SHA256 - <https://en.wikipedia.org/wiki/SHA-2>
 pub(crate) fn sha256(data: &[u8]) -> B256 {
     B256::from(Sha256::digest(data).as_ref())
 }