Merge pull request #39172 from foxish/fix-help

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

pkg/kubectl/cmd/cmd.go

@@ -191,6 +191,7 @@ __custom_func() {
     * persistentvolumeclaims (aka 'pvc')
     * persistentvolumes (aka 'pv')
     * pods (aka 'po')
+    * poddisruptionbudgets (aka 'pdb')
     * podsecuritypolicies (aka 'psp')
     * podtemplates
     * replicasets (aka 'rs')