Merge branch 'aakriti.gupta-master-patch-05645' into 'master'

Add documentation on object storage replication introduced in 16.4

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143802



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Javiera Tapia <jtapia@gitlab.com>
Approved-by: Sampath Ranasinghe <sranasinghe@gitlab.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Reviewed-by: Javiera Tapia <jtapia@gitlab.com>
Co-authored-by: Aakriti Gupta <agupta@gitlab.com>
Co-authored-by: Javiera Tapia <jtapia@gitlab.com>