[Documentation] Add information about Katib controller flags

[andreyvelich]

/kind feature

As we can see here: https://github.com/kubeflow/katib/blob/master/cmd/katib-controller/v1beta1/main.go#L48-L55, user can specify flags for the Katib Controller.
I think it would be good if we can document this information in Kubeflow website or in developer guide.

/good-first-issue
/area docs

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In response to this:

/kind feature

As we can see here: https://github.com/kubeflow/katib/blob/master/cmd/katib-controller/v1beta1/main.go#L48-L55, user can specify flags for the Katib Controller.
I think it would be good if we can document this information in Kubeflow website or in developer guide.

/good-first-issue
/area docs

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[andreyvelich]

/lifecycle frozen

[annajung]

Opened up a PR to address the documentation. Please take a look when you can @andreyvelich

[andreyvelich]

Thank you so much for doing this @annajung!
I will take a look soon.