Docs for authorization feature

[israel-hdez]

What this PR does / why we need it:

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 #

Checklist:

• Have you added unit/e2e tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

Release note:
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NONE

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[openshift-ci]

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[Jooho]

Where can I find this envoyfilter ?

[israel-hdez]

It is not an envoyfilter, it is a configuration in the ServiceMeshControlPlane. See: https://github.com/opendatahub-io/kserve/pull/253/files#diff-649512b8d7a6b58f996c1a23ee4e257cf224998c7ef287cc3b722b8f8c07ddcbR71

[Jooho]

curious. Is it still techpreview?

[israel-hdez]

I think yes.