Merge pull request #49722 from ardaguclu/kep-3104

Add KUBECTL_KUBERC environment variable description

Author: k8s-ci-robot

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

@@ -382,6 +382,14 @@ kubectl [flags]
 </td>
 </tr>
 
+<tr>
+<td colspan="2">KUBECTL_KUBERC</td>
+</tr>
+<tr>
+<td></td><td style="line-height: 130%; word-wrap: break-word;">When set to true, kuberc file is taken into account to define user specific preferences.  
+</td>
+</tr>
+
 </tbody>
 </table>