Refactor fmt::Display impls in rustdoc
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yotamofek
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…le times Also, utilize the fact that `Symbol` impls `Display`, no need to go through `as_str()`
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This PR does a couple of things, with the intention of cleaning up and streamlining some of the
fmt::Displayimpls in rustdoc:fmt::from_fninstead of open-coding it.Itertools::formatwith the method itself.Symbol::as_str(), replace someformat!()calls with lazier optionsThe changes are mostly cosmetic but some of them might have a slight positive effect on performance.