This is to fix below typos in release notes:
Keytone
specifed
availabilty
maange
expetected
migratons
maintanance
Change-Id: Ifbecf095f2f549d4ec40892484ec1b725927fb44
nova-network is deprecated. The 2.36 microversion makes the
network REST APIs fail with a 404. And the network CLIs/APIs
in python-novaclient are being deprecated. So we should also
deprecate the nova-manage commands that use nova-network.
Change-Id: I5efeb5e5c552064028ae0dea5ce5314c5d92cf0e