Update misleading webhook authentication documentation

[CharlyRipp]

Update misleading information that HTTPS is required and link to self-documented code to find more edge-case configuration options.

HTTPS is not required for the Webhook Authentication, but definitely is recommended. Was also a bit of a pain to hunt down additional configurations - figured a link to the struct would be handy for those with edge cases instead of spelling them all out directly in the doc site.

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[sftim]

We (SIG Docs) strongly prefer actually documenting this kind of detail, rather than signposting users to source code.

The umbrella issue #23889 is also about improving experience for readers who want to understand configuration and other data formats that are not part of the main Kubernetes HTTP API.

I recommend one of:

1. save it for later
   • omit this line, for now
   • log an issue (a child of Document the unpublished APIs #23889) about adding that page
   • in the same issue, also mention changing https://k8s.io/docs/reference/access-authn-authz/authentication/ to link there
2. add a new reference page with a very basic outline of the kubeconfig format (as part of this PR), then link to that

[sftim]

Thanks @CharlyRipp

I like the spirit of this PR. That said, would it be OK to update just line 460 initially?

[CharlyRipp]

Thank you @sftim

#23889 definitely seems like a much better way. I've removed the excess changes.

[celestehorgan]

/lgtm

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LGTM label has been added.

Git tree hash: d50325c7d8ddd92add6cceb38c9e31a00e424180

[tengqm]

/approve

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