StyleImageInterface definition differs from the documented interface

[DiogoAndre]

mapbox-gl-js version: Master

The StyleImageInterface defined on style/style_image.js is different from the version documented on the same file. The return type for the render() function is implemented as void but documented as boolean, which looks like the correct return type.

export type StyleImageInterface = {
    width: number,
    height: number,
    data: Uint8Array | Uint8ClampedArray,
    render?: () => void,
    onAdd?: (map: Map, id: string) => void,
    onRemove?: () => void
};

 * @function
 * @memberof StyleImageInterface
 * @instance
 * @name render
 * @return {boolean} `true` if this method updated the image. `false` if the image was not changed.

[ryanhamley]

Closed by #9604