(DOCSP-21714) Highlight v10 connector on landing page (#96)

* (DOCSP-21714) Highlight v10 on landing page

Author: zach-carr

source/index.txt

@@ -8,6 +8,22 @@ The `MongoDB Connector for Spark
 <https://www.mongodb.com/products/spark-connector>`_ provides
 integration between MongoDB and Apache Spark.
 
+.. note::
+
+   Version 10.x of the MongoDB Connector for Spark is an all-new 
+   connector based on the latest Spark API. Install and migrate to 
+   version 10.x to take advantage of new capabilities, such as tighter 
+   integration with 
+   :ref:`Spark Structured Streaming <spark-structured-streaming>`.
+
+   Version 10.x uses the new namespace 
+   ``com.mongodb.spark.sql.connector.MongoTableProvider``. 
+   This allows you to use old versions of the connector 
+   (versions 3.x and earlier) in parallel with version 10.x.
+
+   To learn more about the new connector and its advantages, see the 
+   `MongoDB announcement blog post <https://dochub.mongodb.org/core/spark-connector-v10-announcement-blog>`__.
+
 With the connector, you have access to all Spark libraries for use with
 MongoDB datasets: Datasets for analysis with SQL (benefiting from
 automatic schema inference), streaming, machine learning, and graph