Merge pull request kubernetes#56860 from bboreham/patch-3

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>.

Typo

**What this PR does / why we need it**:

Fix typo in "Kuberntes"

```release-note
NONE
```

Author: Kubernetes Submit Queue

api/openapi-spec/README.md

@@ -4,7 +4,7 @@ This folder contains an [OpenAPI specification][openapi] for Kubernetes API.
 
 ## Vendor Extensions
 
-Kuberntes extends OpenAPI using these extensions. Note the version that
+Kubernetes extends OpenAPI using these extensions. Note the version that
 extensions has been added.
 
 ### `x-kubernetes-group-version-kind`