Remove beta pre-requisites from validating admission policies docs

[nagygergo]

With 1.30 stable, the feature does not need to be enabled and the v1beta1 API group is not needed.

Description

Issue

Closes: #

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[dipesh-rawat]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 0c108ca9f7f5d50f66eabd5ec511269ed062c8e7

[kundan2707]

Preview

[kundan2707]

/lgtm

[sftim]

Thanks

If you'd also like to update the rest of the page @nagygergo, you could review our style guide and propose updates where this document isn't aligned to it.

This change is good to merge!

/approve

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