proxy setting of rpm-ostree doc needs updating

[ChiuWang]

This file /etc/yum.repos.d/CentOS-Base.repo according to proxy-settings doesn't exist now.

[mscherer]

It depend on the version of Atomic, what version did you try on ? (I guess it might be clearer if we qualify the example)

[ChiuWang]

I use fedora atomic
atomic -v 1.22.1
os-tree --version 2018.2
@mscherer

[mscherer]

Ok so yeah, it would be another file. (cause dnf, cause different filename). Not sure what would be the best way to not duplicate the filename or be harder to read :/