update advanced PUSH_TX

docs/contracts.rst

@@ -150,7 +150,7 @@ As an example, contract ``CheckLockTimeVerify`` ensures coins are timelocked and
     }
 
 More details can be found in `this article <https://medium.com/@xiaohuiliu/op-push-tx-3d3d279174c1>`_.
-To customize ECDSA signing, such as choosing ephemeral key, there is a more general version called `TxAdvanced <https://medium.com/@xiaohuiliu/advanced-op-push-tx-78ce84f69a66>`_.
+To customize ECDSA signing, such as choosing ephemeral key, there is a more general version called `Tx.checkPreimageAdvanced() <https://medium.com/@xiaohuiliu/advanced-op-push-tx-78ce84f69a66>`_.
 
 Full List
 ---------
@@ -183,4 +183,4 @@ Full List
 .. [#] ``Y`` is hashing function return type and can be Ripemd160/Sha1/Sha256/Ripemd160
 
 .. _BIP143: https://github.com/bitcoin-sv/bitcoin-sv/blob/master/doc/abc/replay-protected-sighash.md
-.. _OP_CLTV: https://en.bitcoin.it/wiki/Timelock#CheckLockTimeVerify
+.. _OP_CLTV: https://en.bitcoin.it/wiki/Timelock#CheckLockTimeVerify