rbd:fix comment in tcmu_rbd_cfg_desc
fix rbd backstore device creation guideline in tcmu_rbd_cfg_desc
to make it more reliable to follow.
@@ -929,7 +929,7 @@ static int tcmu_rbd_handle_cmd(struct tcmu_device *dev, struct tcmulib_cmd *cmd)
*
* Specify poolname/devicename, e.g,
*
- * $ targetcli create /backstores/user:rbd/test 2G rbd/test/osd_op_timeout=30
+ * $ targetcli /backstores/user:rbd create test 2G rbd/test/osd_op_timeout=30
*
* poolname must be the name of an existing rados pool.
*
