message: Fix duplication of lines in docs
diff: @@ -83,9 +83,8 @@ Either way, the contents of `utils.rs` define a single public function `set_pani
  ```rust
  // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
  - // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global // allocator.
  - // allocator. #[cfg(feature = "wee_alloc")]
  - if #[cfg(feature = "wee_alloc")] { #[global_allocator]
  + // allocator.
  + if #[cfg(feature = "wee_alloc")] {
  #[global_allocator] static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
  ```
  