Fix up a lot of the documentation for storage pools.
Fix up a lot of the documentation for storage pools.

This makes it much more correct.  It also adds an alias
for create_vol_xml -> create_volume_xml and
create_vol_xml_from -> create_volume_xml_from.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

klynch/ruby-libvirt,klynch/ruby-libvirt,klynch/ruby-libvirt