Merge pull request #28957 from kahveci/patch-2

Fix inconsistent writing of "control plane"

Author: k8s-ci-robot

content/en/docs/reference/glossary/kube-controller-manager.md

@@ -11,7 +11,7 @@ tags:
 - architecture
 - fundamental
 ---
- Control Plane component that runs {{< glossary_tooltip text="controller" term_id="controller" >}} processes.
+ Control plane component that runs {{< glossary_tooltip text="controller" term_id="controller" >}} processes.
 
 <!--more-->