Update docs/en/tutorials/cdc_dfu_flash.rst

Co-authored-by: Lucas Saavedra Vaz <[email protected]>

Author: jurstu

docs/en/tutorials/cdc_dfu_flash.rst

@@ -67,7 +67,7 @@ Go to the Tools menu in the Arduino IDE and set the following options:
 * USB DFU On Boot -> Enabled
 
 3. Flash
-^^^^^^^^^^^^^^
+^^^^^^^^
 
 Now you can upload your sketch to the device. After flashing, you need to manually reset the device.