Getting started button updated to user manual

Author: jcarolinares

content/hardware/04.pro/boards/portenta-x8/product.md

@@ -1,7 +1,7 @@
 ---
 title: Portenta X8
 url_shop: https://store.arduino.cc/portenta-x8
-url_guide: /software/ide-v1/tutorials/getting-started/cores/arduino-mbed_portenta
+url_guide: /tutorials/portenta-x8/user-manual
 core: arduino:mbed_portenta
 certifications: [CE]
 productCode: '125'