use-cases: clarify vhost-user-nvme status in using-spdk-vhost-user
SPDK vhost-user-nvme target is removed from SPDK 21.07 release since
upstreamed QEMU version does not support. Fixes this usage.
Fixes
@@ -104,7 +104,7 @@ devices:
- `vhost-user-blk`
- `vhost-user-scsi`
-- `vhost-user-nvme`
+- `vhost-user-nvme` (deprecated from SPDK 21.07 release)
For more information, visit [SPDK](https://spdk.io) and [SPDK vhost-user target](https://spdk.io/doc/vhost.html).
