Merge pull request #2610 from CpuID/cpuid_ecs_service_docs_iam

Fix aws_ecs_service iam_role docs

website/source/docs/providers/aws/r/ecs_service.html.markdown

@@ -20,7 +20,7 @@ resource "aws_ecs_service" "mongo" {
   cluster = "${aws_ecs_cluster.foo.id}"
   task_definition = "${aws_ecs_task_definition.mongo.arn}"
   desired_count = 3
-  iam_role = "${aws_iam.foo.id}"
+  iam_role = "${aws_iam_role.foo.arn}"
 
   load_balancer {
     elb_name = "${aws_elb.foo.id}"