Docs: Added short explanation of ImageBitmap

docs/api/loaders/ImageBitmapLoader.html

@@ -11,7 +11,7 @@
 		<h1>[name]</h1>
 
 		<div class="desc">
-			A loader for loading an [page:Image] as an [link:https://developer.mozilla.org/de/docs/Web/API/ImageBitmap ImageBitmap].
+			A loader for loading an [page:Image] as an [link:https://developer.mozilla.org/de/docs/Web/API/ImageBitmap ImageBitmap]. An ImageBitmap provides an asynchronous and resource efficient pathway to prepare textures for rendering in WebGL.
 
 		</div>