Cabbage Patch Kid had such a bloodless introduction to their loving homes.In a new documentary out Friday, “Billion Dollar Babies: The True Story of the Cabbage Patch Kids,” director Andrew Jenks peels back the layers of cabbage leaves to tell the zany story how these baby sized cuddly dolls became a pop-culture juggernaut — and ushered in an era of Black Friday retail violence.Forty years ago, adults flooded malls and toy stores, physically brawling to get their hands on this “It” toy. In November 1983, the stories — and the injuries — racked up quickly.