Remove ksonnet from ksonnet-example.jsonnet

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

README.md

@@ -517,13 +517,13 @@ Standard Kubernetes manifests are all written using [ksonnet-lib](https://github
 
 [embedmd]:# (examples/ksonnet-example.jsonnet)
 ```jsonnet
-local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
-local daemonset = k.apps.v1beta2.daemonSet;
-
 ((import 'kube-prometheus/kube-prometheus.libsonnet') + {
    nodeExporter+: {
-     daemonset+:
-       daemonset.mixin.metadata.withNamespace('my-custom-namespace'),
+     daemonset+: {
+       metadata+: {
+         namespace: 'my-custom-namespace',
+       },
+     },
    },
  }).nodeExporter.daemonset
 ```

examples/ksonnet-example.jsonnet

-local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
-local daemonset = k.apps.v1beta2.daemonSet;
-
 ((import 'kube-prometheus/kube-prometheus.libsonnet') + {
    nodeExporter+: {
-     daemonset+:
-       daemonset.mixin.metadata.withNamespace('my-custom-namespace'),
+     daemonset+: {
+       metadata+: {
+         namespace: 'my-custom-namespace',
+       },
+     },
    },
  }).nodeExporter.daemonset