Update readiness probe docs to match observed behaviour

[NovemberZulu]

Description

This PR updates documentation about readiness probes to explicitly state that pods that are being terminating (i.e. .metadata.deletionTimestamp is set) still have Ready condition "True" and .status.Phase == "Running". I kept the exiting text, but looking at

1. https://github.com/kubernetes/kubernetes/blob/f64b651ebae643d422f4625161dc415970e2c166/pkg/kubelet/prober/prober_manager.go#L298 and https://github.com/kubernetes/kubernetes/blob/f64b651ebae643d422f4625161dc415970e2c166/pkg/kubelet/prober/prober_manager.go#L339

2. https://github.com/kubernetes/kubernetes/blob/f64b651ebae643d422f4625161dc415970e2c166/pkg/kubelet/prober/worker.go#L259

I'd say that liveness probes are processed the same way no matter is the pod is terminating or not. Please advice if we should rephrase the note more, or remove it entirely. Thank you!

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