DOCSP-46695: Add extra info on load balancing to connection targets page

Author: mcmorisi

source/connect/connection-targets.txt

@@ -9,7 +9,7 @@ Choose a Connection Target
    :values: reference
 
 .. meta::
-   :keywords: connection string, URI, server, settings, client
+   :keywords: connection string, URI, server, settings, client, load balancing
 
 .. contents:: On this page
    :local:
@@ -68,6 +68,28 @@ deployment:
    uri = "mongodb://localhost:27017/"
    client = MongoClient(uri)
 
+Multiple Deployments
+--------------------
+
+You can connect to multiple MongoDB deployments by specifying a list of ``mongos``
+servers in your connection string.
+
+The following code shows how to use {+driver-short+} to connect to three ``mongos``
+instances:
+
+.. code-block:: python
+
+   from pymongo import MongoClient
+   
+   client = MongoClient("mongodb://host1:27017,host2:27017,host3:27017")
+
+{+driver-short+} evenly load balances operations across the specified ``mongos`` instances
+within the specified ``localThresholdMS`` of the lowest-latency ``mongos`` instance. The
+``localThresholdMS`` option defaults to ``15``.
+
+To learn more about how {+driver-short+} load balances operations across multiple
+``mongos`` instances, see the :ref:`pymongo-server-selection` guide.
+
 Replica Sets
 ------------