Rollup merge of #148585 - GuillaumeGomez:improve-format-code, r=yotamofek

[rustdoc] Replace `print` methods with functions to improve code readability

We have a lot of `print` methods, making it quite tricky to know what the types we're manipulating are.

We did something similar with `Clean` trait a few years ago (the first PR was rust-lang/rust#99638, followed by a lot of them).

Each commit replaces one type for easier review.

r? `````@yotamofek`````

Author: matthiaskrgr