Merge pull request #29216 from danwinship/ipblock-selectors

Add a manual anchor to an interesting spot in the NetworkPolicy docs

Author: k8s-ci-robot

content/en/docs/concepts/services-networking/network-policies.md

@@ -154,6 +154,7 @@ contains two elements in the `from` array, and allows connections from Pods in t
 
 When in doubt, use `kubectl describe` to see how Kubernetes has interpreted the policy.
 
+<a name="behavior-of-ipblock-selectors"></a>
 __ipBlock__: This selects particular IP CIDR ranges to allow as ingress sources or egress destinations. These should be cluster-external IPs, since Pod IPs are ephemeral and unpredictable.
 
 Cluster ingress and egress mechanisms often require rewriting the source or destination IP