Rollup merge of #94551 - darnuria:doc-map-backstick, r=dtolnay
Doc: Fix use of quote instead of backstick in Adapter::map. A little commit to fix documentation rendering and semantics in https://doc.rust-lang.org/std/iter/struct.Map.html#notes-about-side-effects `"` where used around an expression instead \`. Screenshot on doc.rust-lang.org: ![2022-03-03 11-21-43_backstick](https://user-images.githubusercontent.com/2827553/156546536-569b7692-7ac4-4388-8e93-c1628ddc6a0f.png) Looking forward: Maybe reworking the doc to use assert_eq like the upper paragraph: ``` let v: Vec<i32> = vec![1, 2, 3].into_iter().map(|x| x + 1).rev().collect(); assert_eq!(v, [4, 3, 2]); ```
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