Update documentation for kfctl_istio_dex.yaml in website

[krishnadurai]

Documentation for yaml config kfctl_istio_dex in the website needs to be updated in order to:

1. Accommodate comments removed from the KfDef config files. (add v1.0.0 kfdef for all platforms with new kusotmize tool manifests#826)
2. Convert naming to kfctl_istio_dex (Refactor existing_arrikto into a community supported config manifests#599)

/assign @krishnadurai
/cc @yanniszark @johnugeorge
/area docs
/priority p1

Relates to #1582

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[jlewi]

@yanniszark @krishnadurai is anyone working on this?

[yanniszark]

I believe @krishnadurai said he was working on it a couple of days ago.
@krishnadurai does that still hold?
I can take it up if you're too overloaded.

[krishnadurai]

@jlewi @yanniszark I apologise for delaying this. I've made a PR #1707 to address this issue. PTAL.

[sarahmaddox]

This is done.
/close

[k8s-ci-robot]

@sarahmaddox: Closing this issue.

In response to this:

This is done.
/close

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