Add requirements: Arduino Pro subscription

Author: marqdevx

content/hardware/04.pro/boards/portenta-x8/tutorials/custom-container/content.md

@@ -21,9 +21,11 @@ In this tutorial we will create a simple container that we can then upload to th
 
 ### Required Hardware and Software
 
--   [Portenta X8](https://store.arduino.cc/portenta-x8)
--   ADB
--   USB-C cable (either USB-C to USB-A or USB-C to USB-C)
+- [Portenta X8](https://store.arduino.cc/portenta-x8)
+- ADB
+- USB-C cable (either USB-C to USB-A or USB-C to USB-C)
+- Arduino Pro Cloud Subscription. [Learn more about the Pro Cloud](https://www.arduino.cc/pro/hardware/product/portenta-x8).
+
 
 ## Instructions
 

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

@@ -29,8 +29,8 @@ In this tutorial you will see how to manually flash your Portenta X8 with the im
 - Portenta X8
 - Portenta Breakout Board <!-- or Portenta Max Carrier-->
 - Arduino Create account
-- Arduino Create Pro subscription
-- Foundries.io account (linked with the Pro plan)
+- Arduino Pro Cloud Subscription. [Learn more about the Pro Cloud](https://www.arduino.cc/pro/hardware/product/portenta-x8).
+- Foundries.io account (linked with the Pro Cloud subscription)
 - FoundriesFactory® ([Check the Getting Started tutorial](https://docs.arduino.cc/tutorials/portenta-x8/out-of-the-box))
 - 1 Device already attached to your factory ([Check the Getting Started tutorial](https://docs.arduino.cc/tutorials/portenta-x8/out-of-the-box))