If your scrolling is inverted after the installation of Fedora 24, you're in the right place !
You'll also notice that the touchpad section of the mouse parameter in gnome parameters has disapeared.
Don't panic, the fix is easy ! Just install the missing package
sudo dnf install xorg-x11-drv-libinput
After the installation, reboot your computer.
And that's all. The touchpad section should be back as well as your natural scrolling !