[zh] Sync feature gates: port-forward-websockets and iptables-ownership-cleanup

content/zh-cn/docs/reference/command-line-tools-reference/feature-gates/port-forward-websockets.md

@@ -0,0 +1,20 @@
+---
+title: PortForwardWebsockets
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha
+    defaultValue: false
+    fromVersion: "1.30"
+---
+
+<!--
+Allow WebSocket streaming of the
+portforward sub-protocol (`port-forward`) from clients requesting
+version v2 (`v2.portforward.k8s.io`) of the sub-protocol.
+-->
+允许从请求 v2 子协议（`v2.portforward.k8s.io`）的客户端通过 portforward 子协议
+（`port-forward`）执行 WebSocket 流式传输。