fix privay readme link (#1684)

Author: nogang

README.md

@@ -12,7 +12,7 @@ GoQuorum is a fork of [go-ethereum](https://github.com/ethereum/go-ethereum) and
 
 Key enhancements over go-ethereum:
 
-* [__Privacy__](https://consensys.net/docs/goquorum//en/latest/concepts/privacy/privacy/) - GoQuorum supports private transactions and private contracts through public/private state separation, and utilises peer-to-peer encrypted message exchanges (see [Tessera](https://github.com/consensys/tessera)) for directed transfer of private data to network participants
+* [__Privacy__](https://consensys.net/docs/goquorum//en/latest/concepts/privacy/) - GoQuorum supports private transactions and private contracts through public/private state separation, and utilises peer-to-peer encrypted message exchanges (see [Tessera](https://github.com/consensys/tessera)) for directed transfer of private data to network participants
 * [__Alternative Consensus Mechanisms__](https://consensys.net/docs/goquorum//en/latest/concepts/consensus/overview/) - with no need for POW/POS in a permissioned network, GoQuorum instead offers multiple consensus mechanisms that are more appropriate for consortium chains:
     * [__QBFT__](https://consensys.net/docs/goquorum/en/latest/configure-and-manage/configure/consensus-protocols/qbft/) - Improved version of IBFT that is interoperable with Hyperledger Besu
     * [__Istanbul BFT__](https://consensys.net/docs/goquorum/en/latest/configure-and-manage/configure/consensus-protocols/ibft/) - a PBFT-inspired consensus algorithm with transaction finality, by AMIS.