KEP-2831: kubelet tracing GA in 1.34

[ffromani]

Description

Update FG documentation for GA graduation in 1.34

Issue

kubernetes/enhancements#2831

Closes: #N/A

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[lmktfy]

You'll need to drop the mention of a feature gate from https://kubernetes.io/docs/concepts/cluster-administration/system-traces/#kubelet-traces