Link to the new "How to get your MR reviewed, approved, and merged" guide
This adds a reference to the new "How to get your MR reviewed, approved, and merged" documentation in our CONTRIBUTING.md guide.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This adds a reference to the new "How to get your MR reviewed, approved, and merged" documentation in our CONTRIBUTING.md guide.