doc/radosgw: add Zonegroup purpose
Add a note about the telos of zonegroups. The information added in this
commit was originally sent to ceph-users by Casey Bodley on 30 Jun 2023
in response to a question from Yixin Jin. Alexander Patrakov then
suggested that Casey's response should be added to
doc/radsogw/multisite.rst.
Co-authored-by: Casey Bodley <cbodley@redhat.com>
Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit
5c46a1a00962918c885e434986d0f846c3ee4730)