Minor changes

Author: pabel-rh

modules/using-kubernetes-custom-actions/ref-supported-kubernetes-custom-actions.adoc

@@ -24,13 +24,13 @@ Creates a namespace for the Kubernetes cluster in the {product-short}.
 
 |`clusterRef`
 |`string`
-|Required if `url` is not defined. You must specify either `url` or `clusterRef`.
+|Required only if `url` is not defined. You cannot specify both `url` and `clusterRef`.
 |Cluster resource entity reference from the catalog
 |`bar`
 
 |`url`
 |`string`
-|Required if `clusterRef` is not defined. You must specify either `url` or `clusterRef`.
+|Required only if `clusterRef` is not defined. You cannot specify both `url` and `clusterRef`.
 |API url of the Kubernetes cluster
 |`https://api.foo.redhat.com:6443`