Correct the "extra spec" command openstack

Change-Id: Ia348b66a6a4340da8e9d07256a0c141792708cf6

Author: caoyuan

doc/source/data/cinder.csv

@@ -28,7 +28,7 @@ encryption-type-show,volume type list --encryption-show,Shows encryption type de
 encryption-type-update,volume type set --encryption-provider --enc..,Update encryption type information for a volume type (Admin Only).
 endpoints,catalog list,Discovers endpoints registered by authentication service.
 extend,volume set --size,Attempts to extend size of an existing volume.
-extra-specs-list,volume types list --long,Lists current volume types and extra specs.
+extra-specs-list,volume type list --long,Lists current volume types and extra specs.
 failover-host,volume host failover,Failover a replicating cinder-volume host.
 force-delete,volume delete --force,"Attempts force-delete of volume, regardless of state."
 freeze-host,volume host set --disable,Freeze and disable the specified cinder-volume host.
@@ -101,4 +101,4 @@ unmanage,volume delete --remote,Stop managing a volume.
 upload-to-image,image create --volume,Uploads volume to Image Service as an image.
 bash-completion,complete,Prints arguments for bash_completion.
 help,help,Shows help about this program or one of its subcommands.
-list-extensions,extension list --volume,Lists all available os-api extensions.
+list-extensions,extension list --volume,Lists all available os-api extensions.