drm/doc: use proper cross-references for sections

When I originally wrote these docs, I couldn't manage to insert a
cross-reference to a section. Here's how it can be done.

Signed-off-by: Simon Ser <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Cc: Pekka Paalanen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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