Update kube-scheduler.md (#18133)

Fix typo.

content/en/docs/concepts/scheduling/kube-scheduler.md

@@ -35,7 +35,7 @@ kube-scheduler is designed so that, if you want and need to, you can
 write your own scheduling component and use that instead.
 
 For every newly created pod or other unscheduled pods, kube-scheduler
-selects a optimal node for them to run on.  However, every container in
+selects an optimal node for them to run on.  However, every container in
 pods has different requirements for resources and every pod also has
 different requirements. Therefore, existing nodes need to be filtered
 according to the specific scheduling requirements.