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Rollup merge of #59664 - DevQps:improve-yield-spinlock-docs, r=alexcrichton
Updated the documentation of spin_loop and spin_loop_hint
# Description
- Updated the description of `core::hints::spin_loop`
- Updated the description of `core::async::spin_loop_hint`
Both documentation is rewritten to better reflect when one should prefer using a busy-wait spin-loop (and the `spin_loop` and `spin_loop_hint` functions) over `yield_now`. It also dives a little bit deeper on what the function actually does.
closes#55418
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