Updating WindowsGraceNodeShutdown.md for v1.34

Signed-off-by: Mark Rossett <[email protected]>

Author: marosset

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

@@ -9,6 +9,10 @@ stages:
   - stage: alpha
     defaultValue: false
     fromVersion: "1.32"
+    toVersion: "1.33"
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.34"
 
 ---
 Enables support for windows node graceful shutdown in kubelet.