Minor typos in configmap/log-format-upstream

[FlorentATo]

The configuration snippet for log-format-upstream has two minor typos:

• $request_time is duplicated: request_time and duration
• There's a missing space before "method"

/kind documentation /remove-kind bug

[longwuyuan]

/triage accepted

[github-actions[bot]]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.