message: update subscriber message if none exists
diff: @@ -47,7 +47,7 @@ const PubSubSubscriber: React.FC = () => {
  {resourceAlert && (
  <>
  <Alert variant="default" title="No Subscriber available" isInline>
  - To create a Subscriber create, a Knative Service from the Add page.
  + To create a Subscriber, first create a Knative Service from the Add page.
  </Alert>
  &nbsp;
  </>
  