Revise the feature gate LegacyServiceAccountTokenCleanUp to stable

Author: yt2985

content/en/docs/reference/command-line-tools-reference/feature-gates/legacy-service-account-token-clean-up.md

@@ -13,6 +13,10 @@ stages:
   - stage: beta
     defaultValue: true
     fromVersion: "1.29"
+    toVersion: "1.29"
+  - stage: stable
+    defaultValue: true
+    fromVersion: "1.30"
 ---
 Enable cleaning up Secret-based
 [service account tokens](/docs/concepts/security/service-accounts/#get-a-token)

content/en/docs/reference/labels-annotations-taints/_index.md

@@ -1105,13 +1105,11 @@ Example: `kubernetes.io/legacy-token-invalid-since: 2023-10-27`
 Used on: Secret
 
 The control plane automatically adds this label to auto-generated Secrets that
-have the type `kubernetes.io/service-account-token`, provided that you have the
-`LegacyServiceAccountTokenCleanUp` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/)
-enabled. Kubernetes {{< skew currentVersion >}} enables that behavior by default.
-This label marks the Secret-based token as invalid for authentication. The value
-of this label records the date (ISO 8601 format, UTC time zone) when the control
-plane detects that the auto-generated Secret has not been used for a specified
-duration (defaults to one year).
+have the type `kubernetes.io/service-account-token`. This label marks the
+Secret-based token as invalid for authentication. The value of this label
+records the date (ISO 8601 format, UTC time zone) when the control plane detects
+that the auto-generated Secret has not been used for a specified duration
+(defaults to one year).
 
 ### endpointslice.kubernetes.io/managed-by {#endpointslicekubernetesiomanaged-by}