docs: Modal for multiple TDS files

Author: igorlukanin

docs/pages/product/apis-integrations/semantic-layer-sync/tableau.mdx

@@ -115,7 +115,9 @@ Click <Btn>Download .tds</Btn> to download a Tableau [data source][tds] file:
   src="https://ucarecdn.com/4b93196e-3128-4b01-bd3f-eab8e7d8a37f/"
 />
 
-Use can open it in Tableau to create a data source.
+In the modal window, select one or more cubes or views and click <Btn>Download
+all selected</Btn> to download a ZIP archive with Tableau data source files, one
+per cube or view. Use can open these files in Tableau to create data sources.
 
 
 [tds]: https://help.tableau.com/current/pro/desktop/en-us/export_connection.htm