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docs: Documented Send and Sync requirements for Mutex + MutexGuard This an attempt to continue where #123225 left off. I did some light clean up from the work done in that PR. I also documented the `!Send` + `Sync` implementations for `MutexGuard` to the best of my knowledge. Let me know if I got anything wrong 😄 fixes #122856 cc: ``@IoaNNUwU`` r? ``@joboet``