fix README of nginx-ingress-controller
fix README of nginx-ingress-controller

kubernetes/ingress-gce,kubernetes/ingress-nginx,danielqsj/ingress,nicksardo/ingress,canhnt/ingress,caicloud/ingress,aledbf/ingress-nginx,danielqsj/ingress,canhnt/ingress,aledbf/ingress-nginx,chentao1596/ingress,nicksardo/ingress,kubernetes/ingress-nginx,nicksardo/ingress,canhnt/ingress,aledbf/ingress-nginx,caicloud/ingress,aledbf/ingress-nginx,kubernetes/ingress-nginx,nicksardo/ingress,kubernetes/ingress-nginx,jcmoraisjr/ingress,caicloud/ingress,canhnt/ingress,jcmoraisjr/ingress,caicloud/ingress,kubernetes/ingress-gce,jcmoraisjr/ingress,kubernetes/ingress-nginx,chentao1596/ingress