Updated example

Author: nvillahermosa-mdb

source/connection-strings/mongodb-database-connection-strings.txt

@@ -58,11 +58,13 @@ For example, to use an account named ``migrator-service`` with password
 Adding X.509 Authentication
 ---------------------------
 
-To connect to MongoDB using X.509 authentication, set the following options:
+To connect to MongoDB using X.509 authentication, omit a username and password.
+Instead, specify the on-premises host and port or the Atlas cluster URL and set 
+the following options:
 
 .. code-block::
 
-   <atlas or on-premises connection URI>?authSource=$external&authMechanism=MONGODB-X509&tlsCertificateKeyFile=/path/to/cert/client.p12&tlsCertificateKeyFilePassword=certpassword
+   <on-premises host:port or clusterurl.mongodb.net>?authSource=$external&authMechanism=MONGODB-X509&tlsCertificateKeyFile=/path/to/cert/client.p12&tlsCertificateKeyFilePassword=certpassword
 
 
 .. list-table::