Docs and examples use config.k8s.io/function annotation

- Update function docs to recommend new annotation
- Update examples to use config.k8s.io/function annotation

functions/examples/validator-kubeval/README.md

@@ -18,7 +18,7 @@ the `API` struct definition in [main.go](image/main.go) for documentation.
 ## Function invocation
 
 The function is invoked by authoring a [local Resource](local-resource)
-with `metadata.configFn` and running:
+with `metadata.annotations.[config.k8s.io/function]` and running:
 
     kustomize config run local-resource/
 

functions/examples/validator-kubeval/local-resource/example-use.yaml

@@ -4,9 +4,10 @@
 apiVersion: examples.config.kubernetes.io/v1beta1
 kind: Kubeval
 metadata:
-  configFn:
-    container:
-      image: gcr.io/kustomize-functions/example-validator-kubeval:v0.1.0
+  annotations:
+    config.k8s.io/function: |
+      container:
+        image: gcr.io/kustomize-functions/example-validator-kubeval:v0.1.0
 spec:
   strict: true
   ignoreMissingSchemas: true