clarify wording

Author: jordan-smith721

source/connection-troubleshooting.txt

@@ -270,7 +270,7 @@ Monitor Thread Exception
    INFO: Exception in monitor thread while connecting to server ssc-cluster-01-shard-00-02.9cbnp.mongodb.net:27017
 
 This log line indicates that the monitoring thread that continuously
-checks the status of each replica set node failed to contact one of the nodes.
+checks the status of each node in the replica set failed to contact one of the nodes.
 This is an expected message during server maintenance operations and can be safely ignored.
 
 Certificate Request Exception