Description of problem:
In the appendix with Kickstart syntax reference for Fedora 23, it says that ostreesetup accepts --nogpgcheck to disable GPG checks, while this is in fact --nogpg.

Version-Release number of selected component (if applicable):
Fedora 23

How reproducible:
Consistent

Steps to Reproduce:
1. Make a signed rpm-ostree repo
2. Use ostreesetup to install it and add --nogpgcheck

Actual results:
An error that --nogpgcheck is unknown.

Expected results:
A correctly pulled down tree.

Additional info:
Using --nogpg does what is expected.