Add kustomization and transformer references (#5523)

* Add fields to kustomization file ref

* Address grammar feedback.

* labels.fields

site/content/en/docs/Reference/API/Kustomization File/namespace.md

@@ -6,5 +6,16 @@ weight: 12
 description: >
     Adds namespace to all resources.
 ---
+`apiVersion: kustomize.config.k8s.io/v1beta1`
 
-The Tasks section contains examples of how to use [`namespace`](/docs/tasks/namespaces_and_names/).
+See the [Tasks section] for examples of how to use `namespace`.
+
+### namespace
+Adds namespace to all resources.
+
+* **namespace** (string)
+
+    Namespace to add to all resources. This will override Namespace values that already exist.
+
+
+[Tasks section]: /docs/tasks/namespaces_and_names/