KEP-127: Mark as implemented

Code PR moving to GA is merged already:
	kubernetes/kubernetes#136792

Let's mark this as implemented.

Signed-off-by: Rodrigo Campos <rodrigo@amutable.com>

Author: rata

keps/sig-node/127-user-namespaces/kep.yaml

@@ -6,7 +6,7 @@ authors:
   - "@saschagrunert"
 owning-sig: sig-node
 participating-sigs: []
-status: implementable
+status: implemented
 creation-date: 2021-11-02
 reviewers:
   - "@SergeyKanzhelev" # sig-node-assigned-reviewer
@@ -28,7 +28,7 @@ feature-gates:
     components:
       - kubelet
       - kube-apiserver
-disable-supported: true
+disable-supported: false
 
 metrics:
   - started_user_namespaced_pods_total (exposed by kubelet)