docs: update missed rename of import to test-utils as the new default (#2102)

Signed-off-by: Hilbrand Bouwkamp <hilbrand@h72.nl>

Author: Hilbrand

docs/fr/guide/extending-vtu/plugins.md

@@ -96,7 +96,7 @@ wrapper.findByTestId('name-input'); // retourne un VueWrapper ou DOMWrapper
 Implémentation du plugin :
 
 ```js
-import { config } from '@vue/test-utils-next';
+import { config } from '@vue/test-utils';
 
 const DataTestIdPlugin = (wrapper) => {
   function findByTestId(selector) {

docs/guide/extending-vtu/plugins.md

@@ -103,7 +103,7 @@ wrapper.findByTestId('name-input') // returns a VueWrapper or DOMWrapper
 Implementation of the plugin:
 
 ```js
-import { config } from '@vue/test-utils-next'
+import { config } from '@vue/test-utils'
 
 const DataTestIdPlugin = (wrapper) => {
   function findByTestId(selector) {