Rollup merge of #71637 - mibac138:cfg-sanitize, r=petrochenkov

Minor formatting changes in `cfg-sanitize.md`

src/doc/unstable-book/src/language-features/cfg-sanitize.md

@@ -11,7 +11,7 @@ depending on whether a particular sanitizer is enabled or not.
 
 ## Examples
 
-``` rust
+```rust
 #![feature(cfg_sanitize)]
 
 #[cfg(sanitize = "thread")]
@@ -31,6 +31,4 @@ fn b() {
         // ...
     }
 }
-
 ```
-