[bootlin/training-materials] 2fc2b1: sysdev-linux-intro-versioning: remove unused diagram

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 2fc2b11442ab9c194c42a09fa5b255651a49aa0a
      https://github.com/bootlin/training-materials/commit/2fc2b11442ab9c194c42a09fa5b255651a49aa0a
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2023-01-24 (Tue, 24 Jan 2023)

  Changed paths:
    R slides/sysdev-linux-intro-versioning/linux-releases.dia

  Log Message:
  -----------
  sysdev-linux-intro-versioning: remove unused diagram

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