[bootlin/training-materials] d4486c: Replace "Unix" by "UNIX"

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: d4486cc3b630693562f2d8d1a99538cc9e87d55d
      https://github.com/bootlin/training-materials/commit/d4486cc3b630693562f2d8d1a99538cc9e87d55d
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2023-01-24 (Tue, 24 Jan 2023)

  Changed paths:
    M agenda/linux-kernel-online-fr-agenda.tex
    M labs/sysdev-thirdparty-bbb/sysdev-thirdparty-bbb.tex
    M labs/sysdev-thirdparty-qemu/sysdev-thirdparty-qemu.tex
    M labs/sysdev-thirdparty-stm32/sysdev-thirdparty-stm32.tex
    M slides/sysdev-software-stacks/sysdev-software-stacks.tex
    M slides/sysdev-toolchains-definition/sysdev-toolchains-definition.tex

  Log Message:
  -----------
  Replace "Unix" by "UNIX"

That's the more frequent variant

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