Change limits to requests

in the example for pod overhead - we need to have requests section instead of limits

Author: suhasadhav

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

@@ -68,13 +68,13 @@ spec:
     stdin: true
     tty: true
     resources:
-      limits:
+      requests:
         cpu: 500m
         memory: 100Mi
   - name: nginx-ctr
     image: nginx
     resources:
-      limits:
+      requests:
         cpu: 1500m
         memory: 100Mi
 ```