docs: fix OSD Dedicated Network docs
docs: fix OSD Dedicated Network docs

reflect new hostNetwork API of CephCluster to Advanced Configuration docs

Signed-off-by: taeuk_kim <07d6775d6dc470582f8f9eaed84edc463608d7dd@tmax.co.kr>

rook/rook,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook,rook/nfs