docs(docs.nestjs.com) show example of enabling Throttle rate limiting…

content/security/rate-limiting.md

@@ -72,7 +72,23 @@ findAll() {
 
 #### Proxies
 
-If your application runs behind a proxy server, check the specific HTTP adapter options ([express](http://expressjs.com/en/guide/behind-proxies.html) and [fastify](https://www.fastify.io/docs/latest/Reference/Server/#trustproxy)) for the `trust proxy` option and enable it. Doing so will allow you to get the original IP address from the `X-Forwarded-For` header, and you can override the `getTracker()` method to pull the value from the header rather than from `req.ip`. The following example works with both express and fastify:
+If your application runs behind a proxy server, check the specific HTTP adapter options ([express](http://expressjs.com/en/guide/behind-proxies.html) and [fastify](https://www.fastify.io/docs/latest/Reference/Server/#trustproxy)) for the `trust proxy` option and enable it. 
+Following example enables `trust proxy` for express adapter:
+
+```typescript
+//main.ts
+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+import { NestExpressApplication } from "@nestjs/platform-express"
+async function bootstrap() {
+  const app = await NestFactory.create<NestExpressApplication>(AppModule);
+  app.set('trust proxy', 'loopback') // specify a single subnet
+  await app.listen(3000)
+}
+bootstrap();
+```
+
+Doing so will allow you to get the original IP address from the `X-Forwarded-For` header, and you can override the `getTracker()` method to pull the value from the header rather than from `req.ip`. The following example works with both express and fastify:
 
 ```typescript
 // throttler-behind-proxy.guard.ts