Kerberos doc kibana link (#61466) (#61619)

Add a note in Kerberos documentation that Kibana requires a
configuration change too, and link to that documentation page.

Author: jkakavas

x-pack/docs/en/security/authentication/kerberos-realm.asciidoc

@@ -62,4 +62,11 @@ server. It contains an encrypted authenticator.
 [[kerberos-realm-configuration]]
 ==== Configuring a Kerberos realm
 
-include::configuring-kerberos-realm.asciidoc[]
+include::configuring-kerberos-realm.asciidoc[]
+
+[[kerberos-realm-kibana]]
+===== Configure Kibana for Kerberos
+
+If you want to use Kerberos to authenticate via your browser and {kib}, you
+need to enable the relevant authentication provider in {kib} configuration. See
+{kibana-ref}/kibana-authentication.html#kerberos[kerberos single sign-on]