Update exposing-tcp-udp-services.md
Update exposing-tcp-udp-services.md

Minor tick missing for syntax highlighting which makes it look ugly on https://kubernetes.github.io/ingress-nginx/user-guide/exposing-tcp-udp-services/
kubernetes/ingress-nginx,caicloud/ingress,canhnt/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,caicloud/ingress,aledbf/ingress-nginx,canhnt/ingress,aledbf/ingress-nginx,canhnt/ingress,kubernetes/ingress-nginx,caicloud/ingress,kubernetes/ingress-nginx,aledbf/ingress-nginx,aledbf/ingress-nginx,canhnt/ingress,caicloud/ingress