docs(k8s): add mention that pool scaling not available during upgrade (#4194)

* docs(k8s): add mention that pool scaling not available during upgrade

* Update containers/kubernetes/how-to/upgrade-kubernetes-version.mdx

Co-authored-by: Benedikt Rollik <[email protected]>

---------

Co-authored-by: Néda <[email protected]>
Co-authored-by: Benedikt Rollik <[email protected]>

Author: 3 people

containers/kubernetes/how-to/upgrade-kubernetes-version.mdx

@@ -35,6 +35,9 @@ You can either upgrade your Kubernetes Kapsule cluster [directly from the Scalew
     <Message type="note">
       It is not possible to downgrade your Kubernetes version once it has been upgraded.
     </Message>
+    <Message type="note">
+       Cluster pools cannot be resized during the upgrade process. Provision resources accordingly.
+    </Message>
 
 ## Upgrading a Kapsule cluster to the next minor version using the CLI