documention on how to configure ceph.conf using ceph_conf_overrides
documention on how to configure ceph.conf using ceph_conf_overrides

Signed-off-by: Andrew Schoen <1bb641dc23c3a93cce4eee683bcf4b2bea7903a3@redhat.com>

dang/ceph-ansible,dang/ceph-ansible,font/ceph-ansible,jtaleric/ceph-ansible,jfcoz/ceph-ansible,fgal/ceph-ansible,jsaintrocc/ceph-ansible,guits/ceph-ansible,bengland2/ceph-ansible,mcsage/ceph-ansible,ceph/ceph-ansible,albertomurillo/ceph-ansible,albertomurillo/ceph-ansible,guits/ceph-ansible,jfcoz/ceph-ansible,verdurin/ceph-ansible-1,mcsage/ceph-ansible,travmi/ceph-ansible,bengland2/ceph-ansible,albertomurillo/ceph-ansible,font/ceph-ansible,rootfs/ceph-ansible,fgal/ceph-ansible,jtaleric/ceph-ansible,rootfs/ceph-ansible,verdurin/ceph-ansible-1,travmi/ceph-ansible,jsaintrocc/ceph-ansible,WingkaiHo/ceph-ansible,ceph/ceph-ansible,WingkaiHo/ceph-ansible,WingkaiHo/ceph-ansible