Martin von Zweigbergk 82829813d6 docs: don't recommend running cargo fmt in the background
Running `cargo fmt` while you're working in an editor means that you
may lose changes because of a race:

1. Your editor reads version X of file
2. `cargo fmt` reads version X
3. You save version Y from your editor
4. `cargo fmt` saves version Z, replacing Y
2023-01-12 11:50:02 -08:00
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