Delete extra comma
Delete extra comma

The comma should be removed from 'virtual, machines'

Closes-Bug: 1597821
Change-Id: I498feb5e6417e14ec033814768debabebb05433e

openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals