docs: update webpack configuration for compression example (#3883)

Author: snitin315

examples/compression/webpack.config.js

@@ -7,4 +7,7 @@ const { setup } = require("../util");
 module.exports = setup({
   context: __dirname,
   entry: "./app.js",
+  devServer: {
+    compress: true,
+  },
 });