Remove custom profiling env var as it is GA now

Author: ardaguclu

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

@@ -350,14 +350,6 @@ kubectl [flags]
 <td></td><td style="line-height: 130%; word-wrap: break-word;">When set to false, turns off extra HTTP headers detailing invoked kubectl command (Kubernetes version v1.22 or later)</td>
 </tr>
 
-<tr>
-<td colspan="2">KUBECTL_DEBUG_CUSTOM_PROFILE</td>
-</tr>
-<tr>
-<td></td><td style="line-height: 130%; word-wrap: break-word;">When set to true, custom flag will be enabled in kubectl debug. This flag is used to customize the pre-defined profiles.
-</td>
-</tr>
-
 <tr>
 <td colspan="2">KUBECTL_EXPLAIN_OPENAPIV3</td>
 </tr>