doc: Update cinder command mapping

I had incorrectly marked the 'api-version' command as WONTFIX. Turns out
we already support this, albeit via keystone as opposed to a
cinder-specific API.

Change-Id: I804ef1ca5a0f4df844d8c2229688c4edbac45aa9
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

Author: stephenfin

doc/source/cli/data/cinder.csv

@@ -1,5 +1,5 @@
 absolute-limits,limits show --absolute,Lists absolute limits for a user.
-api-version,WONTFIX,Display the server API version information.
+api-version,openstack versions show --service volume,Display the server API version information.
 availability-zone-list,availability zone list --volume,Lists all availability zones.
 attachment-complete,volume attachment complete,Complete an attachment for a cinder volume. (Supported by API versions 3.44 - 3.latest)
 attachment-create,volume attachment create,Create an attachment for a cinder volume. (Supported by API versions 3.27 - 3.latest)