Fix the documentation about SDAnimatedImage.animatedImageData to match its behavior
Fix the documentation about SDAnimatedImage.animatedImageData to match its behavior

awkward/SDWebImage,dreampiggy/SDWebImage,rs/SDWebImage,dreampiggy/SDWebImage,zhang-yawei/SDWebImage,awkward/SDWebImage,awkward/SDWebImage,tualatrix/SDWebImage,dreampiggy/SDWebImage