Docs: fix HAProxy name and exporter's link
Just a small fix for HAProxy name (it was written as "HA Proxy", with a space) and Prometheus Exporter link.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Just a small fix for HAProxy name (it was written as "HA Proxy", with a space) and Prometheus Exporter link.