message: elle.printf: Do not forward-declare removed `elle::printf`.
diff: @@ -15,12 +15,6 @@ namespace elle
  namespace
  {
  - /// Print on std::cout.
  - /// \return std::cout.
  - template <typename F, typename... T>
  - std::ostream&
  - printf(F&& fmt, T&&... values);
  -
  /// Print on stream.
  template <typename F, typename... T>
  std::ostream&
  