docs: switch to definition list and code-tags

docs: switch to definition list and code-tags

A definition list is a better semantic match for what this list is
supposed to convey, so let's use that instead. And while we're at it,
let's add some code-tags around filenames, as they stand a bit more out
that way.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>