Add missing io.k8s.description label in client artifacts (#532)

Author: creydr

openshift/ci-operator/knative-images/cli-artifacts/Dockerfile

@@ -17,4 +17,5 @@ LABEL \
       maintainer="[email protected]" \
       description="Red Hat OpenShift Serverless 1 kn Client artifacts" \
       io.k8s.display-name="Red Hat OpenShift Serverless 1 kn Client artifacts" \
-      io.openshift.tags="kn-client-cli-artifacts"
+      io.k8s.description="Red Hat OpenShift Serverless kn Client artifacts" \
+      io.openshift.tags="kn-client-cli-artifacts"