[bootlin/training-materials] 40310c: embedded-linux: restore link to BBB variant materials

[Michael Opdenacker]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 40310ca4e32ec07aa411ee29ad9ca91522c9d1d2
      https://github.com/bootlin/training-materials/commit/40310ca4e32ec07aa411ee29ad9ca91522c9d1d2
  Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
  Date:   2022-11-29 (Tue, 29 Nov 2022)

  Changed paths:
    M slides/beagleboneblack-board-also-supported/beagleboneblack-board-also-supported.tex

  Log Message:
  -----------
  embedded-linux: restore link to BBB variant materials

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