message: prelude doc update
diff: // http://opensource.org/licenses/MIT>, at your option. This file may not be
  // copied, modified, or distributed except according to those terms.
  -//! # Get all relevant traits into scope
  +//! # Re-export of all relevant traits
  //!
  //! Put `argmin::prelude::*` on top of your code to get all relevant traits into scope.
  