Fix wrong label key in scheduling example (#32646)

* Fixed deprecated comment in scheduling-eviction/assign-pod-node.md regarding example pods/pod-with-affinity-anti-affinity.yaml

* Changed the example to a more appropriate one

content/en/examples/pods/pod-with-affinity-anti-affinity.yaml

@@ -8,10 +8,11 @@ spec:
       requiredDuringSchedulingIgnoredDuringExecution:
         nodeSelectorTerms:
         - matchExpressions:
-          - key: kubernetes.io/os
+          - key: topology.kubernetes.io/zone
             operator: In
             values:
-            - linux
+            - antarctica-east1
+            - antarctica-west1
       preferredDuringSchedulingIgnoredDuringExecution:
       - weight: 1
         preference:
@@ -29,4 +30,4 @@ spec:
             - key-2
   containers:
   - name: with-node-affinity
-    image: k8s.gcr.io/pause:2.0
+    image: k8s.gcr.io/pause:2.0