Merge pull request #688 from ZylosLumen/patch-1

Unhide `#[derive(Debug)]` in example

Author: KodrAus

src/kv/mod.rs

@@ -225,7 +225,7 @@
 //!
 //! ```
 //! # use log::kv::Key;
-//! # #[derive(Debug)]
+//! #[derive(Debug)]
 //! struct Data {
 //!     a: i32,
 //!     b: bool,