DOCSP-18514 Added Atlas shoutout to main intro page

Author: ianf-mongodb

source/includes/fact-mongodb-intro.rst

@@ -18,10 +18,7 @@ MongoDB offers both local and cloud-hosted deployment options:
     features such as LDAP and Kerberos support, on-disk encryption,
     and auditing.
 
-- For cloud-hosted deployments, MongoDB offers
-  `Atlas <https://www.mongodb.com/cloud/atlas?tck=docs_server>`__,
-  a hosted MongoDB Enterprise service option in the cloud which 
-  requires no installation overhead and offers a free tier to get started.
-
-The Manual documents features and functionality for MongoDB Community,
-Enterprise, and Atlas deployments.
+- `MongoDB Atlas <https://www.mongodb.com/cloud/atlas?tck=docs_server>`__
+  is a hosted MongoDB Enterprise service option in the cloud which 
+  requires no installation overhead and offers a free tier to get 
+  started.

source/index.txt

@@ -11,8 +11,14 @@ The MongoDB |version| Manual
 
    For new features in MongoDB 4.2 see :doc:`/release-notes/4.2`.
 
+   To download the MongoDB 4.2, go to the `MongoDB Download Center
+   <https://www.mongodb.com/download-center?jmp=docs#production>`_
+
 .. include:: /includes/fact-mongodb-intro.rst
 
+The Manual documents features and functionality for MongoDB Community,
+Enterprise, and Atlas deployments.
+
 Getting Started
 ---------------