Merge pull request #29639 from zlatin/fix-duplicate

Fix duplicate words in kubectl overview

Author: k8s-ci-robot

content/en/docs/reference/kubectl/overview.md

@@ -75,7 +75,7 @@ If you need help, run `kubectl help` from the terminal window.
 
 By default `kubectl` will first determine if it is running within a pod, and thus in a cluster. It starts by checking for the `KUBERNETES_SERVICE_HOST` and `KUBERNETES_SERVICE_PORT` environment variables and the existence of a service account token file at `/var/run/secrets/kubernetes.io/serviceaccount/token`. If all three are found in-cluster authentication is assumed.
 
-To maintain backwards compatibility, if the `POD_NAMESPACE` environment variable is set during in-cluster authentication it will override the default namespace from the from the service account token. Any manifests or tools relying on namespace defaulting will be affected by this.
+To maintain backwards compatibility, if the `POD_NAMESPACE` environment variable is set during in-cluster authentication it will override the default namespace from the service account token. Any manifests or tools relying on namespace defaulting will be affected by this.
 
 **`POD_NAMESPACE` environment variable**