[api-ref] Fix 'volume_id' for in the v3/volumes-v3-volumes-actions.inc
The 'volume_id' in "Revert volume to snapshot" shoud be in the path.
So fix the paremeter.
@@ -122,7 +122,7 @@ Request
.. rest_parameters:: parameters.yaml
- project_id: project_id_path
- - volume_id: volume_id
+ - volume_id: volume_id_path
- revert: revert
- snapshot_id: snapshot_id_4
