DOCSP-15329 doc for database and collection pickers (#139)

Author: kanchana-mongodb

source/includes/steps-add-atlas-data-store.yaml

@@ -44,14 +44,16 @@ content: |
            Corresponds to :datalakeconf:`stores.[n].provider` |json| 
            configuration setting.
 
-        #. Select the |service| cluster that you want to use as a data
-           store from the :guilabel:`Choose Cluster` list.
+        #. Specify the |service| cluster that you want to use as a data
+           store in the :guilabel:`Provide Namespaces in this 
+           project` section. To specify, select the cluster from the 
+           dropdown.
 
            Corresponds to :datalakeconf:`stores.[n].clusterName` |json| 
            configuration setting.
 
-        #. Select the databases and collections that you want to add to
-           your data lake.
+        #. Expand the databases and select the collections that you 
+           want to add to your data lake.
 
            .. tip::