README.md: Mention available_parallelism; explain when to still use num_cpus
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… `num_cpus` With `std::thread::available_parallelism` stabilized in 1.59, some projects may want to switch to it. Document the key difference (minimum Rust version support) to help projects make that decision more carefully.
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With
std::thread::available_parallelismstabilized in 1.59, someprojects may want to switch to it. Document the key difference (minimum
Rust version support) to help projects make that decision more
carefully.