docs: update bonjour example (#3262)

examples/cli/bonjour/README.md

@@ -13,3 +13,30 @@ npm run webpack-dev-server -- --bonjour
 
 A Zeroconf broadcast should occur, containing data with a type of `http` and a
 subtype of `webpack`.
+
+# Bonjour options
+
+Allows options from bonjour for more [configuration](https://github.com/watson/bonjour#initializing):
+
+```js
+// webpack.config.js
+module.exports = {
+  /* ... */
+  devServer: {
+    bonjour: {
+      name: 'webpack-dev-server',
+      type: 'https',
+      subtype: 'webpack',
+    },
+  },
+};
+```
+
+```console
+npm run webpack-dev-server -- --config webpack.config.js
+```
+
+## What Should Happen
+
+A Zeroconf broadcast should occur, containing data with a type of `https` and a
+subtype of `webpack`.