message: fixed ColorMatixFilter documentation issue
diff: @@ -8,7 +8,7 @@ import fragment from './colorMatrix.frag';
  * with a new set of RGBA color and alpha values. It's pretty powerful!
  *
  * ```js
  - * let colorMatrix = new PIXI.ColorMatrixFilter();
  + * let colorMatrix = new PIXI.filters.ColorMatrixFilter();
  * container.filters = [colorMatrix];
  * colorMatrix.contrast(2);
  * ```
  