Update concepts-read-replicas.md

Author: rachel-msft

articles/postgresql/concepts-read-replicas.md

@@ -119,7 +119,7 @@ PostgreSQL requires the value of the `max_connections` parameter on the read rep
 If you try to update the server values, but don't adhere to the limits, you receive an error.
 
 ### max_prepared_transactions
-[PostgreSQL requires](https://www.postgresql.org/docs/10/hot-standby.html) the value of the `max_prepared_transactions` parameter on the read replica to be greater than or equal to the master value; otherwise, the replica won't start. If you want to change `max_prepared_transactions` on the master, first change it on the replicas.
+[PostgreSQL requires](https://www.postgresql.org/docs/10/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS) the value of the `max_prepared_transactions` parameter on the read replica to be greater than or equal to the master value; otherwise, the replica won't start. If you want to change `max_prepared_transactions` on the master, first change it on the replicas.
 
 ### Stopped replicas
 If you stop replication between a master server and a read replica, the replica restarts to apply the change. The stopped replica becomes a standalone server that accepts both reads and writes. The standalone server can't be made into a replica again.