Added scheduler.alpha.kubernetes.io/node-selector annotation (#34477)

* Added scheduler.alpha.kubernetes.io/node-selector annotation

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

Co-authored-by: Rey Lejano <rlejano@gmail.com>

* changed pod to namespace

* added pods in

Co-authored-by: Rey Lejano <rlejano@gmail.com>

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

@@ -306,6 +306,14 @@ sets this label on that Pod. The value of the label is the name of the Pod being
 See [Pod Name Label](/docs/concepts/workloads/controllers/statefulset/#pod-name-label) in the
 StatefulSet topic for more details.
 
+### scheduler.alpha.kubernetes.io/node-selector {#schedulerkubernetesnode-selector}
+
+Example: `scheduler.alpha.kubernetes.io/node-selector: "name-of-node-selector"`
+
+Used on: Namespace
+
+The [PodNodeSelector](/docs/reference/access-authn-authz/admission-controllers/#podnodeselector) uses this annotation key to assign node selectors to pods in namespaces.
+
 ### topology.kubernetes.io/region {#topologykubernetesioregion}
 
 Example: