message: Update comment to reference proper character
  The unicode character comment has been updated to correctly reference
  the character instead of commenting on the variable that might be that
  character.
diff: @@ -208,7 +208,6 @@ impl<'a> RenderableCellsIter<'a> {
  });
  let cursor_color = self.text_cursor_color(&cursor_cell);
  - // This is part of the private use area and shouldn't be used by any font
  cursor_cell.c = font::UNDERLINE_CURSOR_CHAR;
  cursor_cell.fg = cursor_color;
  self.cursor_cells.push_back(Indexed {
  