Update Changelog with note about update to webui 11.1.2
Update chef-server-ctl upgrade instructions to be complete

And include info on when the chef-server-ctl upgrade process
can and cannot be used
Add clarification around nginx[enable_ipv6] option
Clarify directions around making IPv4 listen interface more restrictive
Clarify in the runit section when orphaned process might be found

And clarify how various upgrades should be performed to deal with
orphaned processes