Fix the formmatting issue on some exemples of the "Configure a Block Storage controller"
Fix the formmatting issue on some exemples of the "Configure a Block Storage controller"

Change-Id: I24c3c5c6249396be339079b7c158d4788e3f495d
Closes-Bug: 1249197
backport: havana

gongysh2004/openstack-manual,gongysh2004/openstack-manual,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,Akasurde/openstack-manuals,kairoaraujo/openstack-manuals,Akasurde/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,potsmaster/openstack-manuals