[config-reference] Update the deprecated command option
[config-reference] Update the deprecated command option

The "aggregate-details" option of Nova client has been removed, we
should use "aggregate-show" instead. see
https://github.com/openstack/python-novaclient/blob/master/releasenotes/notes/rm-deprecated-commands-options-ocata-00f249810e5bdf97.yaml

Change-Id: I04c88bb0f3a4ee5cf65ff5b7900228316afa96c5

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals