code: func (f *Fpdf) SetAutoPageBreak(auto bool, margin float64) {
  	f.autoPageBreak = auto
  	f.bMargin = margin
  	f.pageBreakTrigger = f.h - margin
  }
docs: // SetAutoPageBreak enables or disables the automatic page breaking mode. When
  // enabling, the second parameter is the distance from the bottom of the page
  // that defines the triggering limit. By default, the mode is on and the margin
  // is 2 cm.