Docs: Add migration (v8 to v9) instructions for WebWorkers

docs/migration-guide.md

@@ -2,11 +2,14 @@
 
 ## Contents
 
-- [Neutrino v8 to v9](#neutrino-v8-to-v9)
-- [Neutrino v7 to v8](#neutrino-v7-to-v8)
-- [Neutrino v6 to v7](#neutrino-v6-to-v7)
-- [Neutrino v5 to v6](#neutrino-v5-to-v6)
-- [Neutrino v4 to v5](#neutrino-v4-to-v5)
+- [Migration Guide](#migration-guide)
+  - [Contents](#contents)
+  - [Neutrino v8 to v9](#neutrino-v8-to-v9)
+  - [Neutrino v7 to v8](#neutrino-v7-to-v8)
+    - [Migrated Packages](#migrated-packages)
+  - [Neutrino v6 to v7](#neutrino-v6-to-v7)
+  - [Neutrino v5 to v6](#neutrino-v5-to-v6)
+  - [Neutrino v4 to v5](#neutrino-v4-to-v5)
 
 ## Neutrino v8 to v9
 
@@ -364,7 +367,34 @@ object using the [options here](https://webpack.js.org/configuration/dev-server/
 `style.extract` being set to `true` [#1221](https://github.com/neutrinojs/neutrino/pull/1221).
 Override `style.extract.enabled` instead.
 - **BREAKING CHANGE** `@neutrinojs/web` and its dependent middleware no longer include `worker-loader` for automatically
-loading `*.worker.js` files [#1069](https://github.com/neutrinojs/neutrino/pull/1069).
+loading `*.worker.js` files [#1069](https://github.com/neutrinojs/neutrino/pull/1069). In order to use the `worker-loader` your configuration should look like:
+
+```js
+// …
+react({
+  // …
+}),
+(neutrino) => {
+  neutrino.config.output
+    .globalObject('this') // will prevent `window`
+  .end()
+  .module
+    .rule('worker')
+      .test(/\.worker\.js$/)
+      .use('worker')
+        .loader(require.resolve('worker-loader'))
+        // see https://github.com/webpack-contrib/worker-loader#options
+        // .options({
+        //   inline: true,
+        //   fallback: true,
+        // })
+        .end()
+      .end()
+    .end();
+},
+// …
+```
+
 - **BREAKING CHANGE** The loading order for `config.resolve.extensions` has been rearranged to be closer in parity to
 what webpack has configured by default [#1080](https://github.com/neutrinojs/neutrino/pull/1080).
 - **BREAKING CHANGE** The tests directory is now additionally linted by default with `@neutrinojs/eslint` and its