Print the section name and its alias.

def prt_section_key(self, prt=sys.stdout):
        """Print the section name and its alias."""
        for section_name, letter in self.datobj.sec2chr.items():
            mrk = '*' if section_name in self.sec2chr else ""
            prt.write("{M:1} {ABC} {SECT}\n".format(M=mrk, ABC=letter, SECT=section_name))