k8s ErrorPage middleware now uses k8s service

docs/content/middlewares/errorpages.md

@@ -29,8 +29,10 @@ spec:
   errors:
     status:
     - 500-599
-    service: serviceError
     query: /{status}.html
+    service:
+      name: whoami
+      port: 80
 ```
 
 ```json tab="Marathon"
@@ -95,6 +97,9 @@ The status code ranges are inclusive (`500-599` will trigger with every code bet
 
 The service that will serve the new requested error page.
 
+!!! Note
+    In kubernetes, you need to reference a kubernetes service instead of a traefik service.
+
 ### `query`
 
 The URL for the error page (hosted by `service`). You can use `{status}` in the query, that will be replaced by the received status code.