Hi,
The packaging guidelines pages:
https://docs.fedoraproject.org/en-US/packaging-guidelines/
https://fedoraproject.org/w/index.php?title=Packaging:Guidelines&oldi...
still point at the old Filesystem Hierarchy Standard (FHS) site:
http://www.pathname.com/fhs/
This hasn't been updated since something like 2004.
The FHS is now maintained by the Linux Foundation:
https://wiki.linuxfoundation.org/lsb/fhs
David