Update dns forwarding documentation (#3574)
Update dns forwarding documentation (#3574)

Add details about setting up macOS to point to consul for services without the headache of dnsmasq, bind, etc.
youhong316/consul,calgaryscientific/consul,scalp42/consul,vamage/consul,42wim/consul,hashicorp/consul,42wim/consul,youhong316/consul,scalp42/consul,youhong316/consul,i0rek/consul,vamage/consul,youhong316/consul,42wim/consul,scalp42/consul,youhong316/consul,i0rek/consul,i0rek/consul,calgaryscientific/consul,i0rek/consul,42wim/consul,kingland/consul,scalp42/consul,hashicorp/consul,kingland/consul,calgaryscientific/consul,vamage/consul,vamage/consul,kingland/consul,i0rek/consul,hashicorp/consul,hashicorp/consul,scalp42/consul,kingland/consul,calgaryscientific/consul,calgaryscientific/consul,kingland/consul,42wim/consul,vamage/consul