KEP-127: Fix user namespaces feature gate name

The actual feature gate name is `UserNamespacesStatelessPodsSupport`,
which should be reflected in the KEP as well.

Signed-off-by: Sascha Grunert <[email protected]>

Author: saschagrunert

keps/sig-node/127-user-namespaces/README.md

@@ -678,7 +678,7 @@ well as the [existing list] of feature gates.
 -->
 
 - [x] Feature gate (also fill in values in `kep.yaml`)
-  - Feature gate name: UserNamespacesSupport
+  - Feature gate name: UserNamespacesStatelessPodsSupport
   - Components depending on the feature gate: kubelet, kube-apiserver
 
 ###### Does enabling the feature change any default behavior?

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

@@ -21,7 +21,7 @@ milestone:
   alpha: "v1.25"
 
 feature-gates:
-  - name: UserNamespacesSupport
+  - name: UserNamespacesStatelessPodsSupport
     components:
       - kubelet
       - kube-apiserver