(DOCSP-48475) freemium dashboard messaging (#700)

* (DOCSP-48475) freemium dashboard messaging

* (DOCSP-48475) freemium dashboard messaging

Author: carriecwk

source/dashboards.txt

@@ -55,6 +55,14 @@ By default, the most recently modified dashboards are shown first in
 the list. You can change the sort order by using the
 :guilabel:`Sort By` dropdown menu.
 
+.. note::
+
+   For free-tier |service| clusters, a banner with the following text appears at the top of the dashboard:
+
+   ``You are on the |charts| free tier. Upgrade your cluster or navigate to a project with a paid tier to access all of |charts|!``
+
+   Click :guilabel:``View plans`` button to the right of the banner to access the billing page.
+
 .. _create-new-dashboard:
 
 Create a New Dashboard