doc(guides): fix typo in migration guide (#769)

Author: rcaillon-Iliad

docs/guides/migration_guide_v2.md

@@ -247,7 +247,7 @@ resource "scaleway_instance_server" "web" {
 
 ##### Renamed: `scaleway_ip` -> `scaleway_instance_ip`
 
-`scaleway_ip` was renamed to `scaleway_instance_ip` and the `server` attribute, used to attach an IP has been moved to `scaleway_instance_server.id_id`
+`scaleway_ip` was renamed to `scaleway_instance_ip` and the `server` attribute, used to attach an IP has been moved to `scaleway_instance_server.ip_id`
 
 ```hcl
 resource "scaleway_instance_ip" "test_ip" {