update kube proxy critical pod annotation comments to reflect reality

cluster/saltbase/salt/kube-proxy/kube-proxy.manifest

@@ -38,9 +38,8 @@ kind: Pod
 metadata:
   name: kube-proxy
   namespace: kube-system
-  # This annotation lowers the possibility that kube-proxy gets evicted when the
-  # node is under memory pressure, and prioritizes it for admission, even if
-  # the node is under memory pressure.
+  # This annotation ensures that kube-proxy does not get evicted if the node
+  # supports critical pod annotation based priority scheme.
   # Note that kube-proxy runs as a static pod so this annotation does NOT have
   # any effect on rescheduler (default scheduler and rescheduler are not
   # involved in scheduling kube-proxy).