Merge pull request #26082 from natereid72/patch-1

Update service.md, change 'master' to 'control plane'

Author: k8s-ci-robot

content/en/docs/concepts/services-networking/service.md

@@ -238,7 +238,7 @@ There are a few reasons for using proxying for Services:
 
 ### User space proxy mode {#proxy-mode-userspace}
 
-In this mode, kube-proxy watches the Kubernetes master for the addition and
+In this mode, kube-proxy watches the Kubernetes control plane for the addition and
 removal of Service and Endpoint objects. For each Service it opens a
 port (randomly chosen) on the local node.  Any connections to this "proxy port"
 are proxied to one of the Service's backend Pods (as reported via