[DRAFT - KEP-3085] update reference to PodReadyToStartContainers condition

[Priyankasaggu11929]

Description

Docs updates wrt KEP-3085 - kubernetes/enhancements#4138

(The commit in the PR as of this update, doesn't contain anything.
It will updated later based on the changes in k/k PR kubernetes/kubernetes#134660 is merged.)

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