desktop-entry: fix itemizedlist closing tag

Merged Simon Ser requested to merge emersion/xdg-specs:fix-desktop-entry-closing-tag into master

Fixes: 923eb9fe ("Let DBus-activated processes properly integrate on Wayland")

cc @apol @faure

Failed pipeline: https://gitlab.freedesktop.org/xdg/xdg-specs/-/jobs/11944142

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