Fixes link to Cloud documentation (#244)

Author: lcawl

docs/en/install-upgrade/upgrading-stack.asciidoc

@@ -249,8 +249,8 @@ permanently swap in the new cluster.
 only for the time that the new cluster runs in parallel with your old cluster.
 Usage is billed on an hourly basis.
 
-To learn more about the upgrade process on Elastic Cloud, see {cloudref}/upgrading.html[
-Upgrade Versions] and {cloudref}/cluster-config.html[Configuring Elastic Cloud].
+To learn more about the upgrade process on Elastic Cloud, see 
+{cloud}/ec-upgrade-cluster.html[Upgrade versions].
 
 NOTE: Elastic Cloud only supports upgrades to released versions. Preview
 releases and master snapshots are not supported.