Correct the wrong word and the wrong link
Correct the wrong word and the wrong link

The 'Manage Volumes‘ should be 'volume’, and the link is wrong.
This patch fix them.

Change-Id: I64902dee90a0e019ea3bb27fa7c0ee6e8749219d
Closes-Bug: #1554928

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