[KEP-3960] - update docs for GA

Author: AxeZhan

content/en/docs/concepts/containers/container-lifecycle-hooks.md

@@ -64,8 +64,6 @@ There are three types of hook handlers that can be implemented for Containers:
 Resources consumed by the command are counted against the Container.
 * HTTP - Executes an HTTP request against a specific endpoint on the Container.
 * Sleep - Pauses the container for a specified duration. 
-  This is a beta-level feature default enabled by the `PodLifecycleSleepAction`
-  [feature gate](/docs/reference/command-line-tools-reference/feature-gates/). 
 
 {{< note >}}
 The beta level `PodLifecycleSleepActionAllowZero` feature gate which is enabled by default from v1.33.

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

@@ -13,5 +13,9 @@ stages:
   - stage: beta 
     defaultValue: true
     fromVersion: "1.30"
+    toVersion: "1.33"
+  - stage: stable
+    defaultValue: true
+    fromVersion: "1.34"
 ---
 Enables the `sleep` action in Container lifecycle hooks.