update slack instructions
the previous instructions no longer apply, there is no "Incoming WebHooks" row anymore.
luckily there exists direct link to web hooks, so the previous steps aren't even neccessary
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
the previous instructions no longer apply, there is no "Incoming WebHooks" row anymore.
luckily there exists direct link to web hooks, so the previous steps aren't even neccessary