Definition lists are key for explaining terminology, and making them
visually cohesive can help the reader better scan information.
This change introduces a distinct visual hierarchy by:
- Adding a vertical border to group the list items.
- Highlighting terms (dt) with a background color and rounded corners.
- Adding decorative indicators (bullets) to separate entries clearly.
The new style is also intentionally more visually distinct so that
_incorrect_ usage of definition lists (usually due to bad
indentation) can be more easily detected as it won't look good
when not used for things meant to be "definition lists" :)
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
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