fix documentation conflict regarding postStart

[rajattrt]

Fix the documentation conflict regarding postStart on the page - https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#container-states

Current observed behavior is documented here -

https://kubernetes.io/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/#discussion
The Container’s status is not set to RUNNING until the postStart handler completes.

Fixes issue #17795

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[rajattrt]

Signed the CLA