[user-guide]consistent the format in example list
[user-guide]consistent the format in example list

Change-Id: I1c2c8369c06defd24ea986739d938062d33ff562
Closes-Bug: #1572811

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