message: docs(contributing): fix backend port
  8080 -> 8088
diff: @@ -526,7 +526,7 @@ There are three types of assets you can build:
  #### Webpack dev server
  -The dev server by default starts at `http://localhost:9000` and proxies the backend requests to `http://localhost:8080`. It's possible to change these settings:
  +The dev server by default starts at `http://localhost:9000` and proxies the backend requests to `http://localhost:8088`. It's possible to change these settings:
  ```bash
  # Start the dev server at http://localhost:9000
  