message: Fix a broken link in a docblock.
diff: @@ -15,7 +15,7 @@ use std::time::{Duration, Instant};
  /// nanoseconds, the values passed to the formatter will be in nanoseconds).
  ///
  /// Implementors are encouraged to format the values in a way that is intuitive for humans and
  -/// uses the SI prefix system. For example, the format used by [WallTime](struct.Walltime.html)
  +/// uses the SI prefix system. For example, the format used by [WallTime](struct.WallTime.html)
  /// can display the value in units ranging from picoseconds to seconds depending on the magnitude
  /// of the elapsed time in nanoseconds.
  pub trait ValueFormatter {
  