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`librustdoc`: return `impl fmt::Display` in more places instead of writing to strings Continuation of #136784 , another attempt at landing the larger parts of #136748 . I'd like to, gradually, make all of the building blocks for rendering docs in `librustdoc` return `impl fmt::Display` instead of returning `Strings`, or receiving a `&mut String` (or `&mut impl fmt::Write`). Another smaller end goal is to be able to get rid of [`write_str`](https://github.com/rust-lang/rust/blob/8dac72bb1d12b2649acd0c190e41524f83da5683/src/librustdoc/html/format.rs#L40-L42). This PR is a large step in that direction. Most of the changes are quite mechanical, and split up into separate commits for easier reviewing (hopefully). I took `print_item` and then started by converting all the functions it called (and their dependencies), and the last commit does the conversion for `print_item` itself. Ignoring whitespace should make reviewing a bit easier. And most importantly, perf run shows pretty good results locally, hopefully CI will also show green 😁 r? `@GuillaumeGomez` , if you feel like it.
For more information about how librustdoc works, see the rustc dev guide.