doc: correct attribution in v20.6.0 changelog
Not sure what happened when these were generated, but the original PR that introduced the feature was omitted and co-authorship on both PRs was lost.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Not sure what happened when these were generated, but the original PR that introduced the feature was omitted and co-authorship on both PRs was lost.