Update in "index.md" file (#870)

Changed the sentence to say "REPLICAOF NO ONE won't discard the previously replicated data"

Author: sivaraman-27

content/commands/replicaof/index.md

@@ -60,7 +60,7 @@ If a Redis server is already acting as replica, the command `REPLICAOF` NO ONE w
 
 If a server is already a replica of some master, `REPLICAOF` hostname port will stop the replication against the old server and start the synchronization against the new one, discarding the old dataset.
 
-The form `REPLICAOF` NO ONE will stop replication, turning the server into a MASTER, but will not discard the replication. So, if the old master stops working, it is possible to turn the replica into a master and set the application to use this new master in read/write. Later when the other Redis server is fixed, it can be reconfigured to work as a replica.
+The form `REPLICAOF` NO ONE will stop replication, turning the server into a MASTER, but will not discard the already replicated data. So, if the old master stops working, it is possible to turn the replica into a master and set the application to use this new master in read/write. Later when the other Redis server is fixed, it can be reconfigured to work as a replica.
 
 ## Examples