[faiproject/fai] 8e675e: fix syntax error

[Mrfai]

  Branch: refs/heads/master
  Home:   https://github.com/faiproject/fai
  Commit: 8e675e804a5997b51553f08939d65d7afdd94cca
      https://github.com/faiproject/fai/commit/8e675e804a5997b51553f08939d65d7afdd94cca
  Author: Thomas Lange <lange at debian.org>
  Date:   2023-12-11 (Mon, 11 Dec 2023)

  Changed paths:
    M doc/fai-guide.txt

  Log Message:
  -----------
  fix syntax error


  Commit: 9249846cb09a255cfb965c7e560aa134fd5f3cdf
      https://github.com/faiproject/fai/commit/9249846cb09a255cfb965c7e560aa134fd5f3cdf
  Author: Thomas Lange <lange at debian.org>
  Date:   2023-12-11 (Mon, 11 Dec 2023)

  Changed paths:
    M lib/subroutines

  Log Message:
  -----------
  do package installation in chroot,  because --root does not work

dpkg --root= fails with unknown system group 'messagebus' in statoverride file


Compare: https://github.com/faiproject/fai/compare/41609468d2c1...9249846cb09a