Ocata went to End of Life several months ago [1], but it took time to
transition all the projects and it was forgotten to mark Ocata series
status as EOL. This patch corrects now Ocata status in
docs.openstack.org.
[1] http://lists.openstack.org/pipermail/openstack-discuss/2021-June/022989.html
Change-Id: I336dc2f679a2f60a52fc6df3bee73a88991f541b