Automatic merge from submit-queue
Add PDB to kubectl get --help.
**What this PR does / why we need it**: Adds PDB to kubectl get --help
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: Fixes https://github.com/kubernetes/kubernetes/issues/39100
**Release note**:
```release-note
NONE
```
/cc @saad-ali @mwielgus
9ce8f10a4d