Make requested comment and change for `renderItems`

src/renderers/webgl/WebGLRenderLists.d.ts

@@ -22,6 +22,7 @@ export interface RenderItem {
 
 export class WebGLRenderList {
 
+	renderItems: Array<RenderItem>;
 	opaque: Array<RenderItem>;
 	transparent: Array<RenderItem>;
 	init(): void;

src/renderers/webgl/WebGLRenderLists.js

@@ -159,6 +159,9 @@ function WebGLRenderList() {
 	}
 
 	return {
+
+		// Note: renderItems temporarily exposed to enable testing of the `finish` function.
+
 		renderItems: renderItems,
 		opaque: opaque,
 		transparent: transparent,