fix example with domain names

guide.html

@@ -271,9 +271,9 @@
 
           # Alternatively, nameservers could be registered as subdomains
 
-          seed.twisterarmy.org NS ns1.twisterarmy.org, ns2.twisterarmy.org
-          ns1.twisterarmy.org  A Server IP
-          ns2.twisterarmy.org  A Server IP
+          seed.domain.org NS ns1.domain.org, ns2.domain.org
+          ns1.domain.org  A Server IP
+          ns2.domain.org  A Server IP
         </pre>
         <h4 class="f-size-16 mb-16 px-12 f-normal">Running</h4>
         <p class="mb-16">Task also could be added into crontab to launch server on @reboot</p>