Katib: Update Katib Config Guide with the new APIs

[andreyvelich]

Fixes: https://github.com/kubeflow/katib/issues/2186.

I updated guide with the new Katib Config APIs.

Please take a look. /assign @tenzen-y @johnugeorge

/cc @kubeflow/release-managers

[andreyvelich]

/hold for review

[tenzen-y]

Ohhh, I would appreciate you for this effort. I really should have done this, but I could not prepare enough time 😓

[andreyvelich]

Ohhh, I would appreciate you for this effort. I really should have done this, but I could not prepare enough time 😓

No worries, thanks again for the implementation! I think, we can merge this change before next release.

[tenzen-y]

I think, we can merge this change before next release.

It makes sense.

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andreyvelich, tenzen-y

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[johnugeorge]

/lgtm /hold cancel