“The Dark Knight Rises” may be on the horizon, but Disney/Marvel’s “The Avengers” can now look at “The Dark Knight” in the rear-view mirror. “The Avengers” grossed $20.3-million this weekend to lift its total domestic take to $552.7-million — rocketing it past Warner Bros./DC’s ”The Dark Knight” ($533.3-million) for third all-time in the record books. The Marvel-superheroes-assembled blockbuster is now the most successful superhero film ever.