Fix FilterSampler#run signature.

Author: BenjaminDRichards

src/renderer/webgl/renderNodes/filters/FilterSampler.js

@@ -62,8 +62,8 @@ var FilterSampler = new Class({
      * @since 4.0.0
      * @param {Phaser.Filters.Sampler} controller - The Sampler filter controller, providing the `region` to sample and the `callback` to receive the result.
      * @param {Phaser.Renderer.WebGL.DrawingContext} inputDrawingContext - The drawing context whose framebuffer will be sampled.
-     * @param {Phaser.Renderer.WebGL.DrawingContext} outputDrawingContext - The output drawing context. Not used by this node.
-     * @param {number} padding - Additional padding around the render area. Not used by this node.
+     * @param {Phaser.Renderer.WebGL.DrawingContext} [outputDrawingContext] - The output drawing context. Not used by this node.
+     * @param {Phaser.Geom.Rectangle} [padding] - Additional padding around the render area. Not used by this node.
      * @return {Phaser.Renderer.WebGL.DrawingContext} The `inputDrawingContext`, returned unchanged.
      */
     run: function (controller, inputDrawingContext, outputDrawingContext, padding)

types/phaser.d.ts

@@ -23205,8 +23205,10 @@ declare namespace Phaser {
          * 
          * Containers can include other Containers for deeply nested transforms.
          * 
-         * Containers can have masks set on them and can be used as a mask too. However, Container children cannot be masked.
-         * The masks do not 'stack up'. Only a Container on the root of the display list will use its mask.
+         * Containers can have masks set on them and can be used as a mask too.
+         * Because masks are filters, the container's children can also have masks,
+         * and the Container's mask will be applied over the top.
+         * In Canvas rendering, only the Container's mask will be applied.
          * 
          * Containers can be enabled for input. Because they do not have a texture you need to provide a shape for them
          * to use as their hit area. Container children can also be enabled for input, independent of the Container.
@@ -120777,7 +120779,7 @@ declare namespace Phaser {
                      * @param padding Additional padding around the render area. Not used by this node.
                      * @returns The `inputDrawingContext`, returned unchanged.
                      */
-                    run(controller: Phaser.Filters.Sampler, inputDrawingContext: Phaser.Renderer.WebGL.DrawingContext, outputDrawingContext: Phaser.Renderer.WebGL.DrawingContext, padding: number): Phaser.Renderer.WebGL.DrawingContext;
+                    run(controller: Phaser.Filters.Sampler, inputDrawingContext: Phaser.Renderer.WebGL.DrawingContext, outputDrawingContext?: Phaser.Renderer.WebGL.DrawingContext, padding?: Phaser.Geom.Rectangle): Phaser.Renderer.WebGL.DrawingContext;
 
                 }