Documentation: rust: testing: add docs on the new KUnit `#[test]` tests

There was no documentation yet on the KUnit-based `#[test]`s.

Thus add it now.

It includes an explanation about the `assert*!` macros being mapped to
KUnit and the support for `-> Result` introduced in these series.

Reviewed-by: David Gow <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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