Doc: Mark last Stein API microversion
Mark that Cinder API 3.59 is the last microversion
for the Stein release.
@@ -459,7 +459,7 @@ Add ``project_id`` attribute to response body of list groups with detail,
list group snapshots with detail, show group detail and show group snapshot
detail APIs.
-3.59
-----
+3.59 (Maximum in Stein)
+-----------------------
Support volume transfer pagination.
