Arch distro command differs

as referenced in: https://unix.stackexchange.com/questions/39370/how-to-reload-udev-rules-without-reboot

docs/setup_toolchain.md

@@ -58,6 +58,12 @@ Next step: [Add keyboard support to Arduino](#add-keyboard-support-to-arduino)
     $ sudo /etc/init.d/udev reload
     ```
     
+    For Arch based distributions the following command will be used instead of `sudo /etc/init.d/udev reload`
+    ```sh
+    $ sudo udevadm control --reload-rules && udevadm trigger
+    ```
+    
+
 4. Then disconnect and reconnect the keyboard for that change to take effect.
 
 5. You may have to tweak the `ARDUINO_PATH` (put this line in your shell-rc)