Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add YAML example to kubectl patch.
**What this PR does / why we need it**:
A YAML example has been requested for the kubectl patch reference doc.
fixes#458
**Special notes for your reviewer**:
* Added a YAML example.
* Updated the description to include JSON patch and JSON merge patch.
**Release note**:
```release-note
NONE
```