changed type of cable (#616)

based on suggestion from Dario Pennisi to use only USB-A to USB-C cable.

Co-authored-by: Sebastian Romero <s.romero@arduino.cc>

Author: akash73

content/hardware/04.pro/boards/portenta-x8/tutorials/image-flashing/content.md

@@ -27,7 +27,7 @@ The instructions below are meant to be used with a Windows Operating System.
 
 ### Required Hardware and Software
 
-- USB-C® to USB-A or USB-C® to USB-C®
+- USB-A to USB-C® cable
 - Portenta X8
 - Portenta Breakout Board or Portenta Max Carrier