Revert "config: document dns options"
Revert "config: document dns options"

This reverts commit 5e57e9273ea6e27eb79ed531189fd3c69e19c7b2.

scalp42/consul,kingland/consul,kingland/consul,kingland/consul,hashicorp/consul,scalp42/consul,calgaryscientific/consul,hashicorp/consul,42wim/consul,vamage/consul,scalp42/consul,scalp42/consul,i0rek/consul,youhong316/consul,calgaryscientific/consul,youhong316/consul,42wim/consul,kingland/consul,vamage/consul,kingland/consul,42wim/consul,i0rek/consul,calgaryscientific/consul,youhong316/consul,calgaryscientific/consul,youhong316/consul,scalp42/consul,hashicorp/consul,42wim/consul,youhong316/consul,vamage/consul,hashicorp/consul,i0rek/consul,vamage/consul,vamage/consul,i0rek/consul,calgaryscientific/consul,42wim/consul,i0rek/consul