doc: Fix list rendering in cli/nova-status.rst

Change-Id: I29ebb4c956ce979d60f74346d93510797f8de76b
Signed-off-by: Takashi Natsume <[email protected]>

Author: takanattie

doc/source/cli/nova-status.rst

@@ -140,11 +140,9 @@ Upgrade
     service was removed in Train.
   * The ``Request Spec Migration`` check was removed.
 
-  **21.0.0 (Ussuri)**
-  * Checks for the Placement API are modified to require version 1.35.
-
   **21.0.0 (Ussuri)**
 
+  * Checks for the Placement API are modified to require version 1.35.
   * Checks for the policy files are not automatically overwritten with
     new defaults.