The documentation for Cells::fill states

pub fn fill(self, value: Fill) -> Self
Sets the cell fill color. It accepts either a specific color, or an array of colors or a 2D array of colors

However I cannot see any way to actually give it a '2D array of colors'

It accepts a Fill which is defined as a struct with a single color in it

pub struct Fill {
color: Option<Box>,
}

Is the documentation out of date, and if so is there some other way or an example that shows how to set a single row background fill?