[DOCS] Fix path to X-Pack repository

Author: lcawl

docs/Versions.asciidoc

@@ -31,7 +31,7 @@ release-state can be: released | prerelease | unreleased
 :es:              Elasticsearch
 :kib:             Kibana
 
-:xes-repo-dir:    {docdir}/../../elasticsearch-extra/x-pack-elasticsearch/docs/en
+:xes-repo-dir:    {docdir}/../../../elasticsearch-extra/x-pack-elasticsearch/docs/en
 
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 Javadoc roots used to generate links from Painless's API reference