BENTONVILLE, Ark. — Retail giant Wal-Mart altered its Web site to acknowledge Christmas less than one day after a conservative Catholic group began a national boycott against the company. The boycott, enacted because of perceived discrimination against Christmas, but not Hanukkah or Kwanzaa, was abandoned when Wal-Mart revised its Web site Nov. 10. Wal-Mart also issued an apology for…