[Manishram-ai]

Closes #173

You can change how the operator logs with controller-runtime's zap flags, but they aren't documented anywhere right now. The only way to find them is --help or reading main.go. This adds a short section about them to the user guide, right after the one about Flink cluster logs.

It covers what each flag does and how to change them on a running operator. It also explains why make run gives you console logs at debug level, while the release YAML and the Helm chart give you JSON at info level. The Helm chart doesn't have a value for extra args yet, so for now the docs tell people to edit the Deployment. If that sounds useful, I can send a small follow-up that adds one to the chart.

I ran the operator locally with these flags to make sure the docs are right. The only surprise was the timestamp format. The --help text says it defaults to epoch, but the logs actually use RFC3339, so that's what I wrote in the docs.