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/template-go-nginx/README.md

@@ -25,7 +25,7 @@ function input, and writing the function output.
 ## 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/template-go-nginx/local-resource/example-use.yaml

@@ -5,8 +5,9 @@ apiVersion: examples.config.kubernetes.io/v1beta1 # call `kustomize config run`
 kind: Nginx
 metadata:
   name: demo
-  configFn:
-    container:
-      image: gcr.io/kustomize-functions/example-nginx:v0.1.0
+  annotations:
+    config.k8s.io/function: |
+      container:
+        image: gcr.io/kustomize-functions/example-nginx:v0.1.0
 spec:
   replicas: 4