Add katib controller flags to developers guide

[annajung]

Signed-off-by: Anna Jung (VMware) antheaj@vmware.com

What this PR does / why we need it:

• Document Katib controller flags in the developer guide
• Flags were based on

  katib/cmd/katib-controller/v1beta1/main.go

  Line 50 in fe64c18

  flag.StringVar(&experimentSuggestionName, "experiment-suggestion-name",

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1239

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.
   N/A

Release note:

NONE

/hold for feedback

[aws-kf-ci-bot]

Hi @annajung. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gaocegege]

/lgtm

Thanks for your contribution! 🎉 👍

[gaocegege]

/ok-to-test

[andreyvelich]

Thank you to update this @annajung!
I left one comment.

[andreyvelich]

Thank you for the contribution!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andreyvelich, annajung

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[annajung]

/hold cancel