docs: add the bundling instruction for Webpack (#1236)

Author: pan93412

docs/bundling.md

@@ -27,4 +27,8 @@ globalThis.__bundlerPathsOverrides = {
 };
 ```
 
-Note that `pino/file`, `pino-worker`, `pino-pipeline-worker` and `thread-stream-worker` are required identifiers. Other identifiers are possible based on the user configuration.
+Note that `pino/file`, `pino-worker`, `pino-pipeline-worker` and `thread-stream-worker` are required identifiers. Other identifiers are possible based on the user configuration.
+
+## Webpack Plugin
+
+If you are a Webpack user, you can achieve this with [pino-webpack-plugin](https://github.com/pinojs/pino-webpack-plugin) without manual configuration of `__bundlerPathsOverrides`; however, you still need to configure it manually if you are using other bundlers.