rustdoc: attribute string literals render with backslashes

I tried this code:

#[must_use = "this is a \
              message"]
pub fn f() {}

I expected to see this happen: Rustdoc will render the string as #[must_use = "this is a message"]

Instead, this happened: It is rendered with a backslash:

rustdoc 1.51.0-nightly (f4eb5d9f7 2021-01-25)

I believe this started in 1.44 via #69686.

(This is a pretty minor issue, I'm not sure it is worth putting energy into, but it does look a little strange.)

Rollup merge of rust-lang#86277 - jsha:remove-must-use, r=Manishearth

Rollup merge of rust-lang#95613 - GuillaumeGomez:fix-rustdoc-attr-dis…

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