some docs

modules/ingress/ingress.tf

@@ -17,6 +17,7 @@ variable "kubernetes_input" {
 
 variable "default_middlewares" {
   type    = string
+  description = "To cross namespace boundaries in Traefik, you must use the @kubernetescrd suffix along with the namespace name using the format: namespace-middlewarename@kubernetescrd."
   default = "traefik-https-redirect@kubernetescrd,traefik-ratelimit@kubernetescrd"
 }