fix(vpc): add dns entry format

Author: RoRoJ

pages/vpc/reference-content/dns.mdx

@@ -49,6 +49,7 @@ The DNS service resolves the following formats:
 <resource_name>.<private-network_name>.internal
 <resource_name>.<private-network_uuid>.internal
 <resource_uuid>.<private-network_uuid>.internal
+<resource_uuid>.<private-network_name>.internal
 ```
 
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