VPA: Add docs about AKS and EKS with Cilium

[adrianmoisey]

Ref:

• AKS: VPA admission controller can't admit pods in kube-system namespace #7392
• EKS: Vertical Pod Autoscaler is not recreating pods at runtime #6915

What type of PR is this?

/kind documentation

What this PR does / why we need it:

More docs to help users

Which issue(s) this PR fixes:

Fixes #6915

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[voelzmo]

Thanks, just a few wording suggestions from my side.

[k8s-ci-robot]

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[adrianmoisey]

Thanks for the review, I've made those suggested changed. Can you take another look?