internal/ethapi: fix typo in comment (ethereum#25056)

typo error: keccack256 -> keccak256

Author: LuozhuZhang

internal/ethapi/api.go

@@ -505,7 +505,7 @@ func (s *PrivateAccountAPI) SignTransaction(ctx context.Context, args Transactio
 }
 
 // Sign calculates an Ethereum ECDSA signature for:
-// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))
+// keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))
 //
 // Note, the produced signature conforms to the secp256k1 curve R, S and V values,
 // where the V value will be 27 or 28 for legacy reasons.
@@ -1741,7 +1741,7 @@ func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, input
 }
 
 // Sign calculates an ECDSA signature for:
-// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message).
+// keccak256("\x19Ethereum Signed Message:\n" + len(message) + message).
 //
 // Note, the produced signature conforms to the secp256k1 curve R, S and V values,
 // where the V value will be 27 or 28 for legacy reasons.