Update PKI realm link

Author: russcam

docs/client-concepts/certificates/working-with-certificates.asciidoc

@@ -122,7 +122,7 @@ the local CA certificate is part of the chain that was used to generate the serv
 
 ==== Client Certificates
 
-X-Pack also allows you to configure a {xpack_current}/pki-realm.html[PKI realm] to enable user authentication
+X-Pack also allows you to configure a {ref_current}/configuring-pki-realm.html[PKI realm] to enable user authentication
 through client certificates. The {ref_current}/certutil.html[`elasticsearch-certutil` tool] included with X-Pack allows you to
 generate client certificates as well and assign the distinguished name (DN) of the
 certificate to a user with a certain role.

src/Tests/Tests/ClientConcepts/Certificates/WorkingWithCertificates.doc.cs

@@ -179,7 +179,7 @@ protected override void AssertHttpRequestException(HttpRequestException e)
 		/**
 		 * ==== Client Certificates
 		 *
-		 * X-Pack also allows you to configure a {xpack_current}/pki-realm.html[PKI realm] to enable user authentication
+		 * X-Pack also allows you to configure a {ref_current}/configuring-pki-realm.html[PKI realm] to enable user authentication
 		 * through client certificates. The {ref_current}/certutil.html[+elasticsearch-certutil+ tool] included with X-Pack allows you to
 		 * generate client certificates as well and assign the distinguished name (DN) of the
 		 * certificate to a user with a certain role.