refine quick start page

Author: zheng-wang

_docs/en/quick-start.md

@@ -79,4 +79,6 @@ In the request edit view, under the Invocation tab, select Method `GET`, enter a
 
 ![Ad Hoc HTTP Invocation](../../screenshots/basic-use/ad-hoc-http-invocation.png)
 
+The request is automatically persisted (no Save button), so no need to worry about data loss across browser or machine restarts.
+
 Docker users: if not using host networking, to enable ATB docker container to call your API on the host machine, use `host.docker.internal` as hostname in the request URL.