Add browser#1408 & #1422 to release notes

release notes/v0.54.0.md

@@ -122,6 +122,7 @@ _what, why, and what this means for the user_
 - [browser#1406](https://github.com/grafana/xk6-browser/pull/1406) fixes panic on iframe attach when iframe didn't contain any UI elements.
 - [browser#1420](https://github.com/grafana/xk6-browser/pull/1420) uses the vu context to control the iterations lifecycle which helps k6 shutdown in a timely manner when a test is aborted.
 - [browser#1421](https://github.com/grafana/xk6-browser/pull/1421) fixes the navigation span by starting when the page starts to load so that it's a better representation of how long the test was on a page.
+- [browser#1408](https://github.com/grafana/xk6-browser/pull/1408), [#1422](https://github.com/grafana/xk6-browser/pull/1422) fixes the `page.reload` API so handles `null` responses without exceptions.
 
 ## Maintenance and internal improvements