docs(guides): mention outputPath and publicPath (#6124)

Author: chenxsan

src/content/guides/asset-modules.mdx

@@ -109,7 +109,7 @@ import mainImage from './images/main.png';
 img.src = mainImage; // '/dist/151cfcfa1bd74779aadb.png'
 ```
 
-All `.png` files will be emitted to the output directory and their paths will be injected into the bundles.
+All `.png` files will be emitted to the output directory and their paths will be injected into the bundles, besides, you can customize [`outputPath`](/configuration/module/#rulegeneratoroutputpath) and [`publicPath`](/configuration/module/#rulegeneratorpublicpath) for them.
 
 ### Custom output filename