Correct example output for "List Volume Details"

In OpenStack Block Storage Service API v2 Reference  - API v2
Replaced file

https://github.com/openstack/volume-api/blob/master/v2/src
/samples/volume_list_detail_response.json

With

http://git.openstack.org/cgit/openstack/api-site/tree/api-ref/src
/wadls/volume-api/src/v2/samples/volume_list_detail_response.json

Change-Id: If58bf5a92755ec7dc52355da483c1f1dc4266ecd
backport: havana
Closes-Bug: #1258533