docs: Update deployment example for configuration (#972)

docs/content/2.deploy/0.index.md

@@ -24,16 +24,18 @@ When deploying to the production using CI/CD, Nitro tries to automatically detec
 
 ## Changing the deployment preset
 
-If you need to build Nitro against a specific provider, you can override it using an environment variable or `nitro.config`. Using environment variable is recommended for deployments depending on CI/CD.
+If you need to build Nitro against a specific provider, you can override it using an environment variable or `nitro.config.ts`. Using environment variable is recommended for deployments depending on CI/CD.
 
 **Example:** Using `NITRO_PRESET`
 ```bash
 NITRO_PRESET=aws-lambda nitro build
 ```
 
-**Example:** Using [nitro.config](/config/)
+**Example:** Using [nitro.config.ts](/config/)
 
 ```ts
+import { defineNitroConfig } from "nitropack";
+
 export default defineNitroConfig({
   preset: 'node-server'
 })