message: Fix VirtualKeyCode config documentation
  The `winit` crate was split off of the `glutin` crate. This patch fixes
  the config link to correctly point to the winit enum instead of the old
  glutin reexport.
diff: # - Key0-Key9
  #
  # A full list with available key codes can be found here:
  -# https://docs.rs/glutin/*/glutin/event/enum.VirtualKeyCode.html#variants
  +# https://docs.rs/winit/*/winit/event/enum.VirtualKeyCode.html#variants
  #
  # Instead of using the name of the keys, the `key` field also supports using
  # the scancode of the desired key. Scancodes have to be specified as a
  