fixup! fix typo in docs/manual/atomic-upgrades.md
fixup! fix typo in docs/manual/atomic-upgrades.md

Closes: #461
Approved by: giuseppe

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