Add removal note for experimental browser

Author: ankur22

release notes/v0.56.0.md

@@ -57,7 +57,9 @@ As part of the stabilization this is now also merged in the k6 codebase. In the
 - [#4072](https://github.com/grafana/k6/pull/4072) Uses the precompiled 'gotip' on the xk6 workflow.
 - [#4084](https://github.com/grafana/k6/pull/4084) Updates usage report to return usage of the deprecated 'ext.loadimpact' option.
 
-## _Optional_ Roadmap
+## Roadmap
 
-_Discussion of future plans_
+### Removal of deprecated `k6/experimental/browser`` module
+
+Since `v0.52.0` we have had a non experimental version of the browser module (`k6/browser`). We urge you to migrate your scripts over to this import since we will be removing the experimental version of the browser module in the next release (`v0.57.0`).