
Automatic merge from submit-queue fix pdb validation bug on spec **What this PR does / why we need it**: When working on issue #48691, I found a bug on current [pdb validation on spec](https://github.com/kubernetes/kubernetes/blob/master/pkg/apis/policy/validation/validation.go#L41-L42). This validation is to check `PodDisruptionBudgetSpec` instead of the whole obj. Currently when doing updates, this check will fail as always. **Which issue this PR fixes** : fix #48691 **Special notes for your reviewer**: **Release note**: ```release-note fix pdb validation bug on PodDisruptionBudgetSpec ```