docs: clarify kube-apiserver version skew policy in compatibility matrix

[Debasish-87]

This PR clarifies kube-apiserver version skew expectations in the Compatibility Matrix section of the README.

Instead of duplicating skew details in the table, it references the official Kubernetes Version Skew Policy to prevent documentation drift and ensure long-term accuracy.

What this PR does / why we need it:

Adds a dedicated section referencing the Kubernetes Version Skew Policy to clarify kube-apiserver compatibility expectations without duplicating skew values in the compatibility table.

Which issue(s) this PR fixes:

Fixes #1484

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[Debasish-87]

Hi maintainers 👋

This PR clarifies kube-apiserver version skew reference
to avoid duplication and documentation drift.

Could someone help with triage and /ok-to-test?

Happy to make any changes if needed. Thanks!

[dgrisonnet]

do you mind moving this piece above the ### kube-apiserver Version Skew section?

[dgrisonnet]

/ok-to-test