Update src/libstd/macros.rs

Removed duplicate line.

Co-Authored-By: DevQps <[email protected]>

Author: Centril

src/libstd/macros.rs

@@ -234,7 +234,6 @@ macro_rules! eprintln {
 /// The `dbg!` macro works exactly the same in release builds.
 /// This is useful when debugging issues that only occur in release
 /// builds or when debugging in release mode is significantly faster.
-/// release mode is significantly faster.
 ///
 /// Note that the macro is intended as a debugging tool and therefore you
 /// should avoid having uses of it in version control for longer periods.