Adding installing steps for testing webhooks

docs/book/src/reference/envtest.md

@@ -144,7 +144,8 @@ var _ = AfterSuite(func() {
 <aside class="note">
 <h1>ENV TEST Config Options</h1>
 
-You can look at the controller-runtime docs to know more about its configuration options, see [here](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/envtest#Environment)
+You can look at the controller-runtime docs to know more about its configuration options, see [here](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/envtest#Environment). On top of that, if you are
+looking to use ENV TEST to test your webhooks then you might want to give a look at its install [options](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/envtest#WebhookInstallOptions).
 
 </aside>
 
@@ -191,12 +192,7 @@ Following an example.
 
 ```go
 BeforeEach(func() {
-	var err error
-	kbc, err = utils.NewTestContext(util.KubebuilderBinName, "GO111MODULE=on")
-	Expect(err).NotTo(HaveOccurred())
-	Expect(kbc.Prepare()).To(Succeed())
-
-	By("installing the cert-manager bundle")
+    By("installing the cert-manager bundle")
 	Expect(kbc.InstallCertManager(false)).To(Succeed())
 
 	By("installing the Prometheus operator")