fix expression

apps/stage-maker/namespace-prefix-policy.yaml

@@ -14,8 +14,8 @@ spec:
     - name: 'only-stage-editor'
       expression: "request.userInfo.username == 'system:serviceaccount:stage-maker:stage-editor'"
   validations:
-    - expression: "object.metadata.namespace.startsWith('team-')"
-      message: "All namespace requests by stage-editor must start with 'team-'"
+    - expression: "object.metadata.name.startsWith('team-')"
+      message: "All namespaces managed by stage-editor must start with 'team-'"
 ---
 apiVersion: admissionregistration.k8s.io/v1
 kind: ValidatingAdmissionPolicyBinding