fix: clarify suggestion that `&T` must refer to `T: Sync` for `&T: Send`#87322

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chazkiker2:fix/suggestion-ref-sync-send

Jul 23, 2021

Commits on Jul 22, 2021

Squash all commits.
chazkiker2
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Commits on Jul 23, 2021

update clippy ui test 'future_not_send.stderr' to match
chazkiker2
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