improve Atomic*::fetch_update docs #49916
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…ennytm improve Atomic*::fetch_update docs This clarifies that fetch_update *always* returns the previous value, either as `Ok(_)` or `Err(_)`, depending on whether the supplied update function returned `Some(_)` or `None`.
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…ennytm improve Atomic*::fetch_update docs This clarifies that fetch_update *always* returns the previous value, either as `Ok(_)` or `Err(_)`, depending on whether the supplied update function returned `Some(_)` or `None`.
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This clarifies that fetch_update always returns the previous value, either as
Ok(_)orErr(_), depending on whether the supplied update function returnedSome(_)orNone.