Give real parameter for the example command
Give real parameter for the example command

Give real parameter for the example command "cinder quota-defaults", and
make consistent with other example commands in this Quotas guide page.

Closes-Bug: #1596780
Change-Id: Ibb8f4985465d4b5910211250a6c8d1267eb3f274

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