DOCSP-16967-inconsistent-connection-string-attribute-description (#385)

* DOCSP-16967-inconsistent-connection-string-attribute-description

* monospace typo

* typo

* clarifications

* fix default database used

* reviewer updates

Author: amalhotra-mdb

source/connect.txt

@@ -345,17 +345,32 @@ To connect to a deployment using TLS, you can either:
 Connect to a Specific Database
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-To connect to a specific database, specify a database in your
-:manual:`connection string URI path </reference/connection-string/>`. If
-you do not specify a database in your URI path, you connect to the
-``test`` database.
+To connect to a specific default database, specify a database in your
+:manual:`connection string URI path </reference/connection-string/>`.
+If unspecified by the connection string, the default database
+is the ``test`` database.
 
 For example, to connect to a database called ``qa`` on localhost, run the
 following command:
 
 .. code-block:: sh
 
-    mongosh "mongodb://localhost:27017/qa" 
+    mongosh "mongodb://localhost:27017/qa"
+
+You can specify the authentication database in your connection string
+using the :urioption:`authSource` connection option. If specified, the
+client uses this database to verify your user identity and credentials. 
+If :urioption:`authSource` is unspecified, it defaults to the default 
+database specified in the connection string. If both :urioption:`authSource` 
+and the default database are unspecified, 
+:urioption:`authSource` defaults to the ``admin`` database.
+
+The following connection string sets the default database to ``myDefaultDB``
+and the authentication database to ``admin``:
+
+.. code-block:: bash
+
+   mongodb://myDatabaseUser:D1fficultP%[email protected]:27017/myDefaultDB?authSource=admin
 
 Proxy Settings
 ~~~~~~~~~~~~~~