Reporting/Docs: Updates for setting to enable CSV Download (elastic#7…

…8101)

* Reporting/Docs - update documentation about setting to enable CSV Download

* break up long setting name to fix table scrolling

docs/settings/reporting-settings.asciidoc

@@ -229,10 +229,10 @@ a| `xpack.reporting.capture.browser`
   See OWASP: https://www.owasp.org/index.php/CSV_Injection
   Defaults to `true`.
 
-| `xpack.reporting.csv.enablePanelActionDownload`
-  | Enables CSV export from a saved search on a dashboard. This action is available in the dashboard
-  panel menu for the saved search.
-  Defaults to `true`.
+| `xpack.reporting.csv` `.enablePanelActionDownload`
+  | Enables CSV export from a saved search on a dashboard. This action is available in the dashboard panel menu for the saved search.
+  *Note:* This setting exists for backwards compatibility, but is unused and hardcoded to `true`. CSV export from a saved search on a dashboard
+  is enabled when Reporting is enabled.
 
 |===