Docs: Update command for starting dev UI on specific port
@@ -30,7 +30,7 @@ npm install
Then you can launch the app as follows:
```bash
-npm start 3001 # 3001 is the port number. Save port 3000
+PORT=3001 npm start # 3001 is the port number. Save port 3000
# for the development API server.
```
