[bootlin/training-materials] 2f5de5: Embedded Linux: fix STM32 U-Boot instructions

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 2f5de50a2899531fd5bff252f58e08297bec5719
      https://github.com/bootlin/training-materials/commit/2f5de50a2899531fd5bff252f58e08297bec5719
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2021-11-09 (Tue, 09 Nov 2021)

  Changed paths:
    M labs/sysdev-u-boot-stm32/sysdev-u-boot-stm32.tex

  Log Message:
  -----------
  Embedded Linux: fix STM32 U-Boot instructions

They were still refering to the Ethernet ports on SAMA5D3 Xplained

Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>