docs: rewrite new alert list panel docs (#50406)
docs: rewrite new alert list panel docs (#50406)

Co-authored-by: brendamuir <4b0a0e4a53fcfacfefd04df34efed9800b15286f@users.noreply.github.com>
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana