kernel-docs: Add new section for Rust learning materials

Include a new section in the Index of Further Kernel Documentation with
resources to learn Rust. Reference it in the Rust index. The resources
are a product of a survey among assistants to the conference Kangrejos'24.

Signed-off-by: Carlos Bilbao <[email protected]>
Reviewed-by: Dirk Behme <[email protected]>
Acked-by: Miguel Ojeda <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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