docs(kubernetes): fix OIDC kubeconfig example context user reference (#87)

docs(kubernetes): fix OIDC kubeconfig example context user reference

Author: derbengel

docs/_managedk8s/clusterlifecycle/oidc/index.en.md

@@ -60,7 +60,7 @@ contexts:
 - context:
     cluster: example-cluster-0
     namespace: mi5
-    user: kubernetes-admin
+    user: oidc
   name: example-cluster-0
 users:
 - name: oidc