Update link to docs about adding a Fleet Server (#1244)

(cherry picked from commit 6d70f69)

Author: dedemorton

docs/getting-started/install-endpoint.asciidoc

@@ -34,7 +34,7 @@ image::images/install-endpoint/add-elastic-endpoint-security.png[Add Endpoint Se
 
 To configure the {agent}, Endpoint Security requires enrollment through Fleet to enable the integration.
 
-IMPORTANT: Before you add an {agent}, a {fleet-server} must be running. See {fleet-guide}/fleet-server.html#add-fleet-server[Add a {fleet-server}].
+IMPORTANT: Before you add an {agent}, a {fleet-server} must be running. See {fleet-guide}/add-a-fleet-server.html[Add a {fleet-server}].
 
 [discrete]
 [[fleet-server-upgrade]]