In order to support automatically updating the release notes when we
create stable branches, we want the pages to be in a standard order.
This patch updates the order to be reverse chronological, so the most
recent notes appear at the top.
Change-Id: Id5b7f4216a9a55249601827896703a6c87991eba
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
e403659799