docs: tweak discovery via DNS doc (#3731)

docs/en/latest/config.json

@@ -127,10 +127,6 @@
       "type": "doc",
       "id": "customize-nginx-configuration"
     },
-    {
-      "type": "doc",
-      "id": "dns"
-    },
     {
       "type": "doc",
       "id": "https"

docs/en/latest/discovery.md

@@ -48,9 +48,11 @@ Common registries: Eureka, Etcd, Consul, Zookeeper, Nacos etc.
 
 ## Supported discovery registries
 
-Currently we support Eureka and service discovery via DNS, like Consul.
+Currently we support Eureka/Consul and service discovery via DNS.
 
-For service discovery via DNS, see [service discovery via DNS](dns.md#service-discovery-via-dns).
+For service discovery via DNS, see [service discovery via DNS](discovery/dns.md).
+
+For Consul, see [service discovery via Consul](discovery/consul_kv.md)
 
 For Eureka, see below.
 
@@ -254,8 +256,3 @@ $ curl http://127.0.0.1:9080/apisix/admin/routes/2 -H 'X-API-KEY: edd1c9f034335f
 Suppose both A-SERVICE and B-SERVICE provide a `/test` API. The above configuration allows access to A-SERVICE's `/test` API through `/a/test` and B-SERVICE's `/test` API through `/b/test`.
 
 **Notice**：When configuring `upstream.service_name`,  `upstream.nodes` will no longer take effect, but will be replaced by 'nodes' obtained from the registry.
-
-## Discovery modules
-
-- eureka
-- [Consul KV](discovery/consul_kv.md)

docs/zh/latest/discovery.md

@@ -47,9 +47,11 @@ title: 集成服务发现注册中心
 
 ## 当前支持的注册中心
 
-目前支持 Eureka 和基于 DNS 的服务注册发现，如 Consul 等。
+目前支持 Eureka / Consul 和基于 DNS 的服务注册发现。
 
-基于 DNS 的服务注册发现见 [基于 DNS 的服务支持发现](../../en/latest/dns.md#service-discovery-via-dns)。
+基于 DNS 的服务注册发现见 [基于 DNS 的服务支持发现](../../en/latest/discovery/dns.md)。
+
+Consul 的支持见 [基于 Consul 的服务支持发现](../../en/latest/discovery/consul_kv.md)
 
 Eureka 的支持方式见下文。