feat(ins): add info that routed ip migration is complete (#4365)

Author: bene2k1

pages/instances/how-to/migrate-routed-ips.mdx

@@ -7,12 +7,16 @@ content:
   paragraph: This page explains how to move your Instance to routed flexible IPs
 tags: instance flexible ip routed
 dates:
-  validation: 2024-11-14
+  validation: 2025-02-06
   posted: 2023-10-11
 categories:
   - compute
 ---
 
+<Message type="note">
+  The migration to routed IPs is now complete. The following information is provided for reference only.
+</Message>
+
 Prior to April 2024, all Instances got a NAT IP from their hosting node, which was routed to the Instance through a [carrier-grade NAT](/instances/concepts/#carrier-grade-nat-cgnat) solution. This was in addition to the public (flexible) IP. The NAT IP let Instances communicate via an underlying internal network, without public IPs. However, if the underlying hypervisor changed, the NAT IP changed also. This could happen when you restarted your Instance. 
 
 Since October 2024 it is no no longer possible to create Instances with NAT IPs. Instead, Instances' public IPs are **routed** IPs. Routing a public IP directly to an Instance bypasses NAT IPs, sending traffic to its [routed flexible IP](/instances/concepts/#routed-flexible-ip). The benefit is the IP stays consistent even if the Instance is restarted or moved. Routed IPs also let you assign multiple flexible IPv4s and IPv6s to an Instance, as both IPv4 and IPv6 are supported.