Merge #3386

3386: docs: use_self: hightlight the "should be" code sample as rust code as well. r=phansch a=matthiaskrgr



Co-authored-by: Matthias Krüger <matthias.krueger@famsik.de>

Author: bors[bot]

clippy_lints/src/use_self.rs

@@ -36,7 +36,7 @@ use crate::syntax_pos::symbol::keywords::SelfType;
 /// }
 /// ```
 /// could be
-/// ```
+/// ```rust
 /// struct Foo {}
 /// impl Foo {
 ///     fn new() -> Self {