Merge pull request #49356 from tengqm/fg-rrhu-132

Add feature gate RemoteRequestHeaderUID v1.32

Author: k8s-ci-robot

content/en/docs/reference/command-line-tools-reference/feature-gates/RemoteRequestHeaderUID.md

@@ -0,0 +1,16 @@
+---
+title: RemoteRequestHeaderUID
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha 
+    defaultValue: false
+    fromVersion: "1.32"
+---
+Enable the API server to accept UIDs (user IDs) via request header authentication.
+This will also make the `kube-apiserver`'s API aggregator add UIDs via standard headers when
+forwarding requests to the servers serving the aggregated API.
+