Add reference and link to kubeconfig on kubectl page

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

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-Kubectl is a command line interface for running commands against Kubernetes clusters.
+Kubectl is a command line interface for running commands against Kubernetes clusters. `kubectl` looks for a file named config in the $HOME/.kube directory. You can specify other [kubeconfig](https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) files by setting the KUBECONFIG environment variable or by setting the [`--kubeconfig`](https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) flag.
+
 This overview covers `kubectl` syntax, describes the command operations, and provides common examples. For details about each command, including all the supported flags and subcommands, see the [kubectl](/docs/reference/generated/kubectl/kubectl-commands/) reference documentation. For installation instructions see [installing kubectl](/docs/tasks/kubectl/install/).
 
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