Initial commit - Adds Portenta Hat Carrier pinout software mapping and secondary url for docs 2.0 (#1670)

Co-authored-by: TaddyHC <k.hochung@arduino.cc>

Author: ArduinoBot

content/hardware/04.pro/carriers/portenta-hat-carrier/downloads/ASX00049-pinout-software-mapping.pdf

@@ -4,6 +4,8 @@ url_shop: https://store.arduino.cc/products/portenta-hat-carrier
 url_guide: /tutorials/portenta-hat-carrier/user-manual
 primary_button_url: /tutorials/portenta-hat-carrier/user-manual
 primary_button_title: User Manual
+secondary_button_url: /downloads/ASX00049-pinout-software-mapping.pdf
+secondary_button_title: Pinout Software Mapping
 certifications: [CE, UKCA, RoHS, FCC, IC, RCM]
 ---