Drop PodHostIPs feature gate in v1.32

Author: tengqm

content/en/docs/reference/command-line-tools-reference/feature-gates/pod-host-ips.md

@@ -17,6 +17,9 @@ stages:
   - stage: stable
     defaultValue: true
     fromVersion: "1.30"
+    toVersion: "1.31"
+removed: true
+
 ---
 Enable the `status.hostIPs` field for pods and the {{< glossary_tooltip term_id="downward-api" text="downward API" >}}.
 The field lets you expose host IP addresses to workloads.