fix log-format-upstream sample
fix log-format-upstream sample

- Align column names to snake case.
- Align the space.
canhnt/ingress,kubernetes/ingress-nginx,aledbf/ingress-nginx,kubernetes/ingress-nginx,canhnt/ingress,canhnt/ingress,aledbf/ingress-nginx,caicloud/ingress,kubernetes/ingress-nginx,canhnt/ingress,aledbf/ingress-nginx,caicloud/ingress,caicloud/ingress,aledbf/ingress-nginx,caicloud/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx