Fix some typo in pod-overhead.md

Uniform case in pod-overhead.md(Kubelet → kubelet).

Author: ydFu

content/en/docs/concepts/scheduling-eviction/pod-overhead.md

@@ -30,7 +30,7 @@ time according to the overhead associated with the Pod's
 [RuntimeClass](/docs/concepts/containers/runtime-class/).
 
 When Pod Overhead is enabled, the overhead is considered in addition to the sum of container
-resource requests when scheduling a Pod. Similarly, Kubelet will include the Pod overhead when sizing
+resource requests when scheduling a Pod. Similarly, the kubelet will include the Pod overhead when sizing
 the Pod cgroup, and when carrying out Pod eviction ranking.
 
 ## Enabling Pod Overhead {#set-up}