DOCSP-18653: remove username from x509 example (#640)

* DOCSP-18653: remove username from x509 example

* CC suggestions

Author: rustagir

source/code-snippets/authentication/x509.js

@@ -1,15 +1,14 @@
 const { MongoClient } = require("mongodb");
 
 // Replace the following with values for your environment.
-const username = encodeURIComponent("<client certificate distinguished name>");
 const clusterUrl = "<MongoDB cluster url>";
 const clientPEMFile = encodeURIComponent("<path to the client pem certificate file>");
 
 const authMechanism = "MONGODB-X509";
 
 // Replace the following with your MongoDB deployment's connection string.
 const uri =
-  `mongodb+srv://${username}@${clusterUrl}/?authMechanism=${authMechanism}&tls=true&tlsCertificateKeyFile=${clientPEMFile}`;
+  `mongodb+srv://${clusterUrl}/?authMechanism=${authMechanism}&tls=true&tlsCertificateKeyFile=${clientPEMFile}`;
 
 // Create a new MongoClient
 const client = new MongoClient(uri);

source/fundamentals/authentication/mechanisms.txt

@@ -244,24 +244,21 @@ The driver checks for your credentials in the following sources in order:
 
 The ``X.509`` authentication mechanism uses
 :wikipedia:`TLS <Transport_Layer_Security>` with X.509 certificates to
-authenticate your user, identified by the distinguished name (DN) of your
-client certificate. For more information on determining the *subject* name from
-the X.509 certificate, see the MongoDB manual :manual:`X.509 tutorial
-</tutorial/configure-x509-client-authentication/#add-x-509-certificate-subject-as-a-user>`.
+authenticate by retrieving the distinguished name (DN) from the
+client certificate.
 
 You can specify this authentication mechanism by setting the following
-parameters of your
-:manual:`connection string </reference/connection-string/>`:
+parameters of your :manual:`connection string </reference/connection-string/>`:
 
-- Set the ``authMechanism`` parameter to the value ``MONGODB-X509``
-- Set the ``tls`` parameter to the value ``true``
+- Set the ``authMechanism`` parameter to ``MONGODB-X509``
+- Set the ``tls`` parameter to ``true``
 
 Pass the location of your client certificate file as the value of
 ``tlsCertificateKeyFile`` as a parameter of the connection URI.
 
 .. important::
-   Always **URI encode** the username and certificate file path using the
-   ``encodeURIComponent`` method to ensure they are correctly parsed.
+   Always **URI encode** the certificate file path using the
+   ``encodeURIComponent`` method to ensure it is parsed correctly.
 
 .. literalinclude:: /code-snippets/authentication/x509.js
    :language: javascript