>+ (synopsis "Spin is a library which implements a simple spinlock")
Just (synopsis "Simple spinlock") is enough. Maybe mention Rust? What do you
think?
> + "Synchronization primitives based on spinning. They may contain
> +data, they are usable without `std` and static initializers are
> +available.")
What does the weird quote (`) mean here? I'd write @code{std}
Otherwise OK!
