man: The min-free-space-percent item goes in [core] section
man: The min-free-space-percent item goes in [core] section

The documentation incorrectly indicates that min-free-space-percent
goes in the [remote "name"] section. It should go in [core] instead.

Closes: #1062
Approved by: cgwalters

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree