Merge pull request #49355 from tengqm/fg-rdsv-132

Add feature gate for RelaxedDNSSearchValidation in v1.32

Author: k8s-ci-robot

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

@@ -0,0 +1,16 @@
+---
+title: RelaxedDNSSearchValidation
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha
+    defaultValue: false
+    fromVersion: "1.32"
+---
+Relax the server side validation for the DNS search string
+(`.spec.dnsConfig.searches`) for containers. For example,
+with this gate enabled, it is okay to include the `_` character
+in the DNS name search string.