Merge pull request hashicorp#6915 from hashicorp/d-consul-warning

[docs] Change consul agent note to callout

website/source/docs/configuration/consul.html.md

@@ -41,7 +41,7 @@ cluster with zero configuration. To put it another way: if you have a Consul
 agent running on the same host as the Nomad agent with the default
 configuration, Nomad will automatically connect and configure with Consul.
 
-An important requirement is that each Nomad agent talks to a unique Consul
+~> An important requirement is that each Nomad agent talks to a unique Consul
 agent. Nomad agents should be configured to talk to Consul agents and not
 Consul servers. If you are observing flapping services, you may have 
 multiple Nomad agents talking to the same Consul agent. As such avoid