Add max MV for Queens and fix formatting
Adding header to denote which microversion was the maximum for
the Queens release and fix some formatting in the last addition
that caused the text to be shown as an indented note.
@@ -395,8 +395,8 @@ Add ``shared_targets`` and ``service_uuid`` fields to volume.
----
Support report backend storage state in service list.
-3.50
-----
+3.50 (Maximum in Queens)
+------------------------
Services supporting this microversion are capable of volume multiattach.
This version does not need to be requested when creating the volume, but can
be used as a way to query if the capability exists in the Cinder service.
