Here's info on the show:

VH1: The Greatest: 200 Greatest Pop Culture Icons
Premieres Monday July 21, 9/8c Featured Artists: Guns N' Roses, ABBA, Aerosmith, Al Pacino, Andy Warhol/Ivan Karp, Aretha Franklin, More...

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The segment of the show with the GNR mention will be repeated on: 7/22 @ 1am; 7/22 @ 11am; 7/22 @ 7pm; 7/23 @ 5pm; 7/24 @ 3pm; 7/25 @ 1pm

According to snakepit.org, Slash isn't collaborating with Gina Gershon after all.

Snakepit.org contacted Slash's management and Slash himself said there is no truth in the news about him writing songs for Gina.