fix docs link

crates/primitives/src/transaction/legacy.rs

@@ -153,7 +153,7 @@ impl TxLegacy {
     /// Outputs the signature hash of the transaction by first encoding without a signature, then
     /// hashing.
     ///
-    /// See [LegacyTx::encode_for_signing] for more information on the encoding format.
+    /// See [Self::encode_for_signing] for more information on the encoding format.
     pub(crate) fn signature_hash(&self) -> H256 {
         let mut buf = BytesMut::with_capacity(self.payload_len_for_signature());
         self.encode_for_signing(&mut buf);