Added info about image location
Added info about image location

Added note with info on how to include location information for images.
Partial-Bug: #1199209

Change-Id: I5c5806e84100a66839987f70871019e26a352546

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