docs(bundlers): clarify webpack config example rename and JS/TS filenames

Author: web-flow

docusaurus/docs/cms/admin-panel-customization/bundlers.md

@@ -80,10 +80,15 @@ strapi develop --bundler=webpack
 ```
 
 :::prerequisites
-Make sure to rename the default `webpack.config.example.js` file into `webpack.config.` before customizing webpack.
+If you plan to customize webpack, start from the example file in your project root. Rename:
+
+- `webpack.config.example.js` → `webpack.config.js` (JavaScript)
+- or `webpack.config.example.ts` → `webpack.config.ts` (TypeScript)
+
+Strapi will pick up `webpack.config.js` or `webpack.config.ts` automatically when you run `strapi develop --bundler=webpack`.
 :::
 
-In order to extend the usage of webpack v5, define a function that extends its configuration inside `/src/admin/webpack.config.`:
+To extend webpack v5, define a function that returns a modified config in `/src/admin/webpack.config.js` or `/src/admin/webpack.config.ts`:
 
 <Tabs groupId="js-ts">
 <TabItem value="js" label="JavaScript">
@@ -118,4 +123,3 @@ export default (config, webpack) => {
 
 </TabItem>
 </Tabs>
-