Fix some typos that I found in documents(except specs)
* fix trivial mistakes(typos)
* fix the link error(rst->html)
* restore it's -> its
* fix k8s -> K8s
Change-Id: I6ec65e9d04441adac210cc9fd476a37a1cb9644f
Document process of upgrading Ceph version without
downtime for Openstack components.
- install ceph charts with luminous v12.2.4 images
- deploy Openstack charts
- update ceph chars to luminous v12.2.5
Change-Id: I98194552b102f57ffb891461fe67d3fdd27d2464