Upgrade sample testdata in the v3x branch

docs/book/src/component-config-tutorial/testdata/project/config/default/kustomization.yaml

@@ -31,6 +31,8 @@ patches:
 # More info: https://book.kubebuilder.io/reference/metrics
 # If you want to expose the metric endpoint of your controller-manager uncomment the following line.
 #- path: manager_metrics_patch.yaml
+#  target:
+#    kind: Deployment
 
 # Mount the controller config file for loading manager configurations
 # through a ComponentConfig type

docs/book/src/component-config-tutorial/testdata/project/config/default/manager_metrics_patch.yaml

@@ -1,13 +1,4 @@
 # This patch adds the args to allow exposing the metrics endpoint securely
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: controller-manager
-  namespace: system
-spec:
-  template:
-    spec:
-      containers:
-      - name: manager
-        args:
-        - "--metrics-bind-address=0.0.0.0:8080"
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-bind-address=:8080