docs: add links to documented drivers

There's a few more drivers that we have docs for that we didn't link to
from the systems article yet. Let's fix that.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Part-of: <!11109>
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