DOCS: remove references to Fedora RPMs

Review Request #8260 — Created June 29, 2016 and submitted — Latest diff uploaded

Information

Review Board
master
d525073...

Reviewers

Fedora can't ship Review Board right now due to Django incompatibility,
so stop recommending Fedora RPMs in the documentation. This can be
re-added later if Review Board gains support for newer Django.

Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>