Update troubleshooting guidance (#576)

(cherry picked from commit f0b3abf)

source/connection-troubleshooting.txt

@@ -268,8 +268,10 @@ Monitor Thread Exception
 
    INFO: Exception in monitor thread while connecting to server ssc-cluster-01-shard-00-02.9cbnp.mongodb.net:27017
 
-To resolve this error, you must install certificates as described under
-:ref:`Security Certificate Errors <java-connection-certificate>`.
+This log line indicates that the monitor that continuously
+checks the status of each replica set member or ``mongos`` server failed to
+contact one of the nodes or servers. This is an expected message during server
+maintenance operations and can be safely ignored.
 
 Certificate Request Exception
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~