Trying to fix DNS alias sentence

Maybe not perfect but it didn't make sense before...

Signed-off-by: kay <[email protected]>

Author: asya999

source/core/sharded-cluster-high-availability.txt

@@ -77,10 +77,10 @@ To avoid downtime when renaming config servers, use DNS names
 unrelated to physical or virtual hostnames to refer to your
 :ref:`config servers <sharding-config-server>`.
 
-Generally, refer to each config server using a name in DNS (e.g. a
+Generally, refer to each config server using DNS alias (e.g. a
 CNAME record). When specifying the config server connection string to
-:program:`mongos`, DNS use this name. These records make it possible
-to renumber or rename config servers without changing the connection
+:program:`mongos`, use these names. These records make it possible
+to change the IP address or rename config servers without changing the connection
 string and without having to restart the entire cluster.
 
 Shard Keys and Cluster Availability