Update migration-guide-beta.20-to-3.0.0.md (#6750)

I did everything but noticed that the documentation isn't clear about hooks. I literally moved contents of the hook.json file to a new file hook.js without the settings key and nothing worked until I moved into settings key as specified in the hooks section.

docs/v3.x/migration-guide/migration-guide-beta.20-to-3.0.0.md

@@ -98,7 +98,33 @@ If you never configured any middlewares you can delete the file all together. Yo
 
 We applied the same logic from the `middleware` configuration to the `hook` configuration.
 
-First you can create a file `./config/hook.js`, and you can move the content of `./config/hook.json` into it.
+First you can create a file `./config/hook.js`, and you can move the content of `./config/hook.json` into it. Hooks should be placed under settings key eg:
+```js
+module.exports = {
+  timeout: 10000,
+  load: {
+    before: ['hook-1', 'hook-2'],
+    order: [
+      "Define the hooks' load order by putting their names in this array in the right order",
+    ],
+    after: ['hook-3', 'hook4'],
+  },
+  settings: {
+     'hook-1': {
+        enabled: true
+     },
+     'hook-2': {
+        enabled: true
+     },
+     'hook-3': {
+        enabled: true
+     },
+     'hook4': {
+        enabled: true
+     },
+  },
+};
+```
 
 ::: tip
 If you never configured any hook you can delete the file all together. You can also only set the configurations you want to customize and leave the others out.