[en]: add missing context module for the go example

The client-go example is missing the param context.
This patch adds the missing param.

Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>

content/en/docs/tasks/administer-cluster/access-cluster-api.md

@@ -174,6 +174,7 @@ as the kubectl CLI does to locate and authenticate to the API server. See this [
 package main
 
 import (
+  "context"
   "fmt"
   "k8s.io/apimachinery/pkg/apis/meta/v1"
   "k8s.io/client-go/kubernetes"
@@ -187,7 +188,7 @@ func main() {
   // creates the clientset
   clientset, _ := kubernetes.NewForConfig(config)
   // access the API to list pods
-  pods, _ := clientset.CoreV1().Pods("").List(v1.ListOptions{})
+  pods, _ := clientset.CoreV1().Pods("").List(context.TODO(), v1.ListOptions{})
   fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
 }
 ```