Clarify comment

dev_mode/webpack.prod.config.js

@@ -8,7 +8,7 @@ config[0] = merge(config[0], {
   devtool: 'source-map',
   output: {
     // Add version argument when in production so the Jupyter server
-    // does not cache the files the static file handler.
+    // allows caching of files (i.e., does not set the CacheControl header to no-cache to prevent caching static files)
     filename: '[name].[contenthash].js?v=[contenthash]'
   },
   optimization: {