Document financial permissions
Created by: MegaphoneJon
See here: https://github.com/civicrm/civicrm-core/pull/7818 Note a blog post exists here: https://civicrm.org/blog/joe-murray/hiding-sensitive-contributions-from-some-staff
I could see refactoring the "permissions and ACLs" into its own chapter to accommodate this, but it's definitely not necessary.