code: func (f *Fpdf) GetTextSpotColor() (name string, c, m, y, k byte) {
  	return f.returnSpotColor(f.color.text)
  }
docs: // GetTextSpotColor returns the most recently used spot color information for
  // text output. This will not be the current text color if some other color
  // type such as RGB is active. If no spot color has been set for text, zero
  // values are returned.