Formatting errors rectified

Author: MagnumOpus21

src/libcore/macros.rs

@@ -349,19 +349,24 @@ macro_rules! try {
 /// write!(&mut v, "s = {:?}", s).unwrap(); // uses io::Write::write_fmt
 /// assert_eq!(v, b"s = \"abc 123\"");
 /// ```
+///
 /// Note : This macro can be used in no_std setups as well
-/// In a no_std setup you are responsible for the 
+/// In a no_std setup you are responsible for the
 /// implementation details of the components.
+///
 /// ```
 ///  # extern crate core;
 ///  use core::fmt::Write;
+///
 ///  struct Example{
 ///  }
+///
 ///  impl Write for Example{
 ///      fn write_str(&mut self, _s: &str) -> core::fmt::Result {
 ///           unimplemented!();
 ///      }
 ///  }
+///
 ///  let mut m = Example{};
 ///  write!(&mut m, "Hello World").expect("Not written");
 /// ```
@@ -734,4 +739,4 @@ mod builtin {
         ($cond:expr,) => ({ /* compiler built-in */ });
         ($cond:expr, $($arg:tt)+) => ({ /* compiler built-in */ });
     }
-}
+}