Tidy up release notes for Train

.../add-horizon-apache-wsgi-parameters-282d4e07126663a6.yaml

...-internal-network-tls-configuration-cf9704812f113281.yaml

...tes/add-neutron-custom-dnsmasq-conf-bba1ac18df0dccd4.yaml

releasenotes/notes/add-qinling-role-99d96102837b21f4.yaml

releasenotes/notes/ansible-min-2.5-7fa76f625bf9f359.yaml

releasenotes/notes/docker-daemon.json-33d7618aa5a355a8.yaml

releasenotes/notes/enable-influxdb-tsi-858cc95e99605107.yaml

releasenotes/notes/freezer-backend-531eececd69c0cd4.yaml

releasenotes/notes/masakari-ddd930cf5db5f713.yaml

...able-designate-coordination-backend-741ec71946e7567e.yaml

.../notes/prometheus-blackbox-exporter-ee096376656c3751.yaml

...es/remove-cinder-hnas_iscsi-backend-03e6242227b9184c.yaml

...remove-heat-engine-environment-file-5f1320011b00099d.yaml

...asenotes/notes/remove-legacy-docker-3c7d6b9568474e3a.yaml

...es/standard-oslo-messaging-sections-4769da25bc58aa02.yaml

...senotes/notes/support_extra_volumes-0598122ed90c8d02.yaml

...asenotes/notes/swift-multi-policies-28bc322b54a82bf9.yaml

releasenotes/notes/swift-recon-91592dd93526f1a8.yaml

releasenotes/notes/trusted-cacert-3c7061e974b5187d.yaml