ACL examples YAML error about mesh

[yekangming]

Correct

kind: TrafficTarget
apiVersion: access.smi-spec.io/v1alpha2
metadata:
  name: whatever
  namespace: whoami
spec:
  destination:
    kind: ServiceAccount
    name: whoami-server
    namespace: whoami
    port: 80
  rules:
    - kind: HTTPRouteGroup
      name: http-everything
      matches:
        - everything
  sources:
    - kind: ServiceAccount
      name: whoami-client
      namespace: whoami

[traefiker]

Closed by #780.