KEP-4832: graduate the async preemption feature to beta

[sanposhiho]

Description

doc update to graduate the async preemption feature to beta

Issue

kubernetes/enhancements#4832

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[Shubham82]

Thanks @sanposhiho
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 900bb06051f65d2eefc3869b02d3ac719b785dfb

[Shubham82]

/hold

unhold it, once Upstream PR(kubernetes/kubernetes#130550) is merged.