Documentation: dev-tools: Add link to RV docs

I could not remember the name of this system and it's pretty hard to
find without the right keywords. I had to ask an LLM!

Drop a breadcrumb to help people find it in the future.

Signed-off-by: Brendan Jackman <jackmanb@google.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240328124947.2107524-1-jackmanb@google.com