This reverts commit 4e8bd619dda87c256ff6a06287de9d7c0f6c0dff.
The original doc is correct. The 5GB journal is create in ceph-osd
bootstrap script in kolla code base[0]. And there is no script to handle
KOLLA_CEPH_OSD_BOOTSTRAP_D label too.
[0] https://github.com/openstack/kolla/blob/master/docker/ceph/ceph-osd/extend_start.sh#L20,L24
Change-Id: Ia1b05af64915c204e185dccde30963d2ad1788ed