documentation

Pull request #1943: feature/ZBX-25049-7.2-D. Replaced "service" with "systemctl" in commands; fixed systemctl syntax.

Merge in WEB/documentation from feature/ZBX-25049-7.2-D to release/7.2

* commit '3714d9e3180647946f1e61c465302b94db697482':
  [ZBX-25049] fixed systemctl syntax
  [ZBX-25049] replaced "service" with "systemctl" in commands