[bootlin/training-materials] 940bc0: yocto-first-build-stm32: update paths

[Alexandre Belloni]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 940bc0d523d664236f331ee3701f5663ea079db9
      https://github.com/bootlin/training-materials/commit/940bc0d523d664236f331ee3701f5663ea079db9
  Author: Alexandre Belloni <alexandre.belloni at bootlin.com>
  Date:   2021-12-14 (Tue, 14 Dec 2021)

  Changed paths:
    M labs/yocto-first-build-stm32/yocto-first-build-stm32.tex

  Log Message:
  -----------
  yocto-first-build-stm32: update paths

Signed-off-by: Alexandre Belloni <alexandre.belloni at bootlin.com>