Guillaume Gomez 7881e0576b
Rollup merge of #100128 - kpreid:waker-doc, r=thomcc
Document that `RawWakerVTable` functions must be thread-safe.

Also add some intra-doc links and more high-level explanation of how `Waker` is used, while I'm here.

Context: https://internals.rust-lang.org/t/thread-safety-of-rawwakervtables/17126
2022-08-26 14:08:45 +02:00
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