docs: fix broken ENS DoH example (#9281)

Author: eth-limo

config/dns.go

@@ -9,7 +9,7 @@ type DNS struct {
 	// https://en.wikipedia.org/wiki/DNS_over_HTTPS
 	//
 	// Example:
-	// - Custom resolver for ENS:          `eth.` → `https://eth.link/dns-query`
+	// - Custom resolver for ENS:          `eth.` → `https://dns.eth.limo/dns-query`
 	// - Override the default OS resolver: `.`    → `https://doh.applied-privacy.net/query`
 	Resolvers map[string]string
 	// MaxCacheTTL is the maximum duration DNS entries are valid in the cache.

docs/config.md

@@ -1928,7 +1928,7 @@ Example:
 {
   "DNS": {
     "Resolvers": {
-      "eth.": "https://eth.link/dns-query",
+      "eth.": "https://dns.eth.limo/dns-query",
       "crypto.": "https://resolver.unstoppable.io/dns-query",
       "libre.": "https://ns1.iriseden.fr/dns-query",
       ".": "https://cloudflare-dns.com/dns-query"
@@ -1968,4 +1968,4 @@ Note: this does NOT work with Go's default DNS resolver. To make this a global s
 
 Default: Respect DNS Response TTL
 
-Type: `optionalDuration`
+Type: `optionalDuration`