Corrected description of AggregateMultiTenancyIsolation
Corrected description of AggregateMultiTenancyIsolation

As per bug, the description required more specificity.

Change-Id: Ic8039a71edf50a45e1c8e461780db861add48f2f
Closes-Bug: #1328400

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