language update from PR comment

src/fragments/lib/pubsub/js/subunsub.mdx

@@ -60,7 +60,7 @@ sub1.unsubscribe();
 
 ## Subscription connection status updates
 
-Now that your application is setup and using pubsub subscriptions, you may want to know when the subscription is finally up and running, or reflect to your users when the subscription isn't healthy. You can monitor the connection state for changes via Hub.
+Now that your application is setup and using pubsub subscriptions, you may want to know when the subscription is finally established, or reflect to your users when the subscription isn't healthy. You can monitor the connection state for changes via Hub.
 
 ```typescript
 import { CONNECTION_STATE_CHANGE, ConnectionState } from '@aws-amplify/pubsub';