docs: Update globals examples (#18805)

* docs: Update globals examples

fixes #18803

* Fix example

Author: nzakas

docs/src/use/configure/language-options.md

@@ -143,3 +143,21 @@ export default [
     }
 ];
 ```
+
+You can include multiple different collections of globals in the same way. The following example includes globals both for web browsers and for [Jest](https://jestjs.io/):
+
+```js
+// eslint.config.js
+import globals from "globals";
+
+export default [
+    {
+        languageOptions: {
+            globals: {
+                ...globals.browser,
+                ...globals.jest
+            }
+        }
+    }
+];
+```

docs/src/use/configure/migration-guide.md

@@ -314,6 +314,7 @@ For example, here's an eslintrc file with language options:
 module.exports = {
     env: {
         browser: true,
+        node: true
     },
     globals: {
         myCustomGlobal: "readonly",
@@ -340,6 +341,7 @@ export default [
             sourceType: "module",
             globals: {
                 ...globals.browser,
+                ...globals.node,
                 myCustomGlobal: "readonly"
             }
         }