Fix two URLs in documentation
The first moved to the wiki inside the new forum, the latter is broken if you don't have the README on your projects' home page set in GitLab.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The first moved to the wiki inside the new forum, the latter is broken if you don't have the README on your projects' home page set in GitLab.