en: fix non-functional link

Signed-off-by: Mujib Ahasan <ahasanmujib8@gmail.com>

little update

Signed-off-by: Mujib Ahasan <ahasanmujib8@gmail.com>

Author: Mujib-Ahasan

content/en/docs/contribute/generate-ref-docs/kubectl.md

@@ -94,7 +94,7 @@ git pull https://github.com/kubernetes/kubernetes {{< skew prevMinorVersion >}}.
 ```
 
 If you do not need to edit the `kubectl` source code, follow the instructions for
-[Setting build variables](#setting-build-variables).
+[Setting build variables](#set-build-variables).
 
 ## Edit the kubectl source code