Documents the Security Solution tag (#3739) (#3839)

* Documents the Security Solution tag

* Update docs/dashboards/dashboards-overview.asciidoc

Co-authored-by: Benjamin Ironside Goldstein <91905639+benironside@users.noreply.github.com>

---------

Co-authored-by: Benjamin Ironside Goldstein <91905639+benironside@users.noreply.github.com>
(cherry picked from commit 3b1fcd2)

Co-authored-by: natasha-moore-elastic <137783811+natasha-moore-elastic@users.noreply.github.com>

docs/dashboards/dashboards-overview.asciidoc

@@ -4,7 +4,7 @@
 
 The following sections describe the {security-app}'s prebuilt dashboards, which provide visualizations of your security environment.
 
-You can also create and access custom security dashboards from the Dashboards landing page. To create one, click **Create Dashboard**. Once created, custom dashboards appear on the page:
+You can also create and access custom security dashboards from the Dashboards landing page. To create one, click **Create Dashboard**. For a custom dashboard to appear on the Dashboards page, it must have the tag `Security Solution`.
 
 image::images/custom-dashboard-setup.png[The dashboards landing page, with the "create dashboard" button and custom dashboards table highlighted]