Duplicated Kandji paragraph in managing-work-devices.md

hey, was reading some references for my startup's handbook and i think managing-work-devices.md has a duplicate paragraph left there by mistake.

The opening paragraph and the macOS one below it explain Kandji in almost the same words. Probably leftover from when the page was rewritten to cover both macOS and Linux. Looks like the intro just needs to keep its first sentence, since the macOS paragraph is the more complete version.

Not a big deal, just didn't want it to go unnoticed.

Open managing-work-devices.md and compare the opening paragraph with the macOS paragraph below it. Confirm that they repeat the Kandji explanation, then verify the page retains the opening paragraph's first sentence and the more complete macOS wording without duplication.

Written by the indexing model from the issue text.