KEP-740: Update with decision on max token lifetime

[HarshalNeelkamal]

- One-line PR description: Choice of max token lifetime was reconsidered during implementation. Documenting it accordingly.

• Issue link: https://github.com/kubernetes/enhancements/issues/740

• Other comments: For ref: https://github.com/kubernetes/kubernetes/pull/128190#discussion_r1821412614

[k8s-ci-robot]

Hi @HarshalNeelkamal. Thanks for your PR.

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[HarshalNeelkamal]

cc/ @liggitt

[liggitt]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HarshalNeelkamal, liggitt

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