Replace Go Doc URL with pkg.go.dev

Author: jihoon-seo

content/en/docs/setup/best-practices/certificates.md

@@ -91,7 +91,7 @@ Required certificates:
 the load balancer stable IP and/or DNS name, `kubernetes`, `kubernetes.default`, `kubernetes.default.svc`,
 `kubernetes.default.svc.cluster`, `kubernetes.default.svc.cluster.local`)
 
-where `kind` maps to one or more of the [x509 key usage](https://godoc.org/k8s.io/api/certificates/v1beta1#KeyUsage) types:
+where `kind` maps to one or more of the [x509 key usage](https://pkg.go.dev/k8s.io/api/certificates/v1beta1#KeyUsage) types:
 
 | kind   | Key usage                                                                       |
 |--------|---------------------------------------------------------------------------------|

content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-certs.md

@@ -173,7 +173,7 @@ The built-in signer is part of [`kube-controller-manager`](/docs/reference/comma
 
 To activate the built-in signer, you must pass the `--cluster-signing-cert-file` and `--cluster-signing-key-file` flags.
 
-If you're creating a new cluster, you can use a kubeadm [configuration file](https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3):
+If you're creating a new cluster, you can use a kubeadm [configuration file](https://pkg.go.dev/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3):
 
 ```yaml
 apiVersion: kubeadm.k8s.io/v1beta3

content/en/docs/tasks/tls/managing-tls-in-a-cluster.md

@@ -47,7 +47,7 @@ some extra application configuration. You will need to add the CA certificate
 bundle to the list of CA certificates that the TLS client or server trusts. For
 example, you would do this with a golang TLS config by parsing the certificate
 chain and adding the parsed certificates to the `RootCAs` field in the
-[`tls.Config`](https://godoc.org/crypto/tls#Config) struct.
+[`tls.Config`](https://pkg.go.dev/crypto/tls#Config) struct.
 
 {{< note >}}
 Even though the custom CA certificate may be included in the filesystem (in the