Address comments

Author: Jefftree

content/en/docs/concepts/overview/kubernetes-api.md

@@ -109,11 +109,11 @@ are provided in the following format:
 
 The relative URLs are pointing to immutable OpenAPI descriptions, in
 order to improve client-side caching. The proper HTTP caching headers
-are also set by the apiserver for that purpose (`Expire` to 1 year in
+are also set by the API server for that purpose (`Expires` to 1 year in
 the future, and `Cache-Control` to `immutable`). When an obsolete URL is
-used, the apiserver will return a redirect to the newest URL.
+used, the API server will return a redirect to the newest URL.
 
-The Kubernetes API server proxies an OpenAPI v3 spec per Kubernetes
+The Kubernetes API server publishes an OpenAPI v3 spec per Kubernetes
 group version at the `/openapi/v3/apis/<group>/<version>?hash=<hash>`
 endpoint.