Fix the doc format
Fix the doc format

The doc is not in good format for lack of one empty line
Change-Id: I7c749c8019142a6b1bf69199fbc053adfc8e6026

hongbin/magnum,openstack/magnum,openstack/magnum,Tennyson53/magnum,sajuptpm/magnum,ffantast/magnum,ffantast/magnum,eshijia/SUR,ddepaoli3/magnum,Tennyson53/SUR,ramielrowe/magnum,mjbrewer/testindex,LaynePeng/magnum,mjbrewer/testindex,ArchiFleKs/magnum,ChengTiesheng/magnum,Alzon/SUR,eshijia/magnum,ddepaoli3/magnum,Tennyson53/magnum,paulczar/magnum,eshijia/SUR,annegentle/magnum,Alzon/SUR,dimtruck/magnum,annegentle/magnum,ArchiFleKs/magnum,Tennyson53/SUR,eshijia/magnum,mjbrewer/testindex,ramielrowe/magnum,paulczar/magnum,jay-lau/magnum,hongbin/magnum,LaynePeng/magnum,dimtruck/magnum,ChengTiesheng/magnum,sajuptpm/magnum