[bootlin/training-materials] c8e06b: labs/sysdev-u-boot-stm32: fix serial device name

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: c8e06bbe45223f42ceaaed099480353882ed9f55
      https://github.com/bootlin/training-materials/commit/c8e06bbe45223f42ceaaed099480353882ed9f55
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2022-11-15 (Tue, 15 Nov 2022)

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

  Log Message:
  -----------
  labs/sysdev-u-boot-stm32: fix serial device name

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