Document feature gate AllowInsecureKubeletCertificateSigningRequests

[sftim]

v1.31 has a feature gate AllowInsecureKubeletCertificateSigningRequests that's not documented. Add it.

/sig auth

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[Shubham82]

Thanks @sftim for the PR
The preview looks good to me.

https://deploy-preview-48155--kubernetes-io-main-staging.netlify.app/docs/reference/command-line-tools-reference/feature-gates/

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7685d280ca766316ff8437f82772c5ca39b06946