`Pool Configuration` was mentioned previously but didn't contain any
info, adding this section and minor cosmetic changes to a few headings
after looking at the html view.
Signed-off-by: Abhishek Lekshmanan <abhishek@suse.com>
Adding basic documentation for new multisite features, with an example
showing 3 zones in a zonegroup.
Fixes: http://tracker.ceph.com/issues/15247
Signed-off-by: Abhishek Lekshmanan <abhishek@suse.com>