DOCSP-46879: Add reference + link to MongoClient keyword arguments

Author: mcmorisi

source/connect/mongoclient.txt

@@ -168,6 +168,11 @@ constructor accepts. All parameters are optional.
 
        **Data type:** `TypeRegistry <{+api-root+}bson/codec_options.html#bson.codec_options.TypeRegistry>`__
 
+You can also pass keyword arguments to the ``MongoClient()`` constructor to specify
+optional parameters. For a complete list of keyword arguments, see the
+`MongoClient <{+api-root+}pymongo/mongo_client.html#pymongo.mongo_client.MongoClient>`__ 
+class in the API documentation.
+
 Concurrent Execution
 --------------------