doc: update error links
It looks like the content at the man7 site was restructured slightly since the doc was originally authored. This fixes the links and adds a separate command for folks to use.
R=@cjihrig
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
It looks like the content at the man7 site was restructured slightly since the doc was originally authored. This fixes the links and adds a separate command for folks to use.
R=@cjihrig