change port 4200 of angular app code example

Example 1: how to assign port in angular

ng serve --port 4401

Example 2: make angular to run on a different port

"projects": {
    "my-cool-project": {
        ... rest of project config omitted
        "architect": {
            "serve": {
                "options": {
                    "port": 1337
                }
            }
        }
    }
}