docs: prepare KubeletConfigDropinDir to Beta

[sohankunkerkar]

xref: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/3983-drop-in-configuration
/sig node

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[drewhagen]

Hello @sohankunkerkar 👋, Please take a look at Documenting for a release - PR Ready for Review to get your PR ready for review before Tuesday 14th November 2023. Thank you!

[drewhagen]

Additionally, I've noticed that the destination branch of this PR is merging into main.
@sohankunkerkar please merge into kubernetes:dev-1.29 branch. Thanks!

[sohankunkerkar]

@drewhagen We decided to move this feature to Beta in 1.30, so I'm closing this PR as there are no doc updates