Add note to replace region in GA

Author: ezilber-akamai

test/integration/models/linode/test_linode.py

@@ -881,6 +881,7 @@ def test_delete_interface_containing_vpc(
 
 def test_create_linode_with_maintenance_policy(test_linode_client):
     client = test_linode_client
+    # TODO: Replace with random region after GA
     region = "eu-central"
     label = get_test_label()