title: How to enable NestJs swagger 4.x plugin
body: <p>How do you use the new swagger plugin? I  have it in my compiler options:</p>
  
  <pre><code>  "compilerOptions": {
      "plugins": ["@nestjs/swagger/plugin"]
    }
  </code></pre>
  
  <p>And I am running the application with <code>nest start</code> as described: <a href="https://docs.nestjs.com/recipes/swagger#migration-to-40" rel="noreferrer">https://docs.nestjs.com/recipes/swagger#migration-to-40</a></p>
  
  <p>However, no automated-magic documentation appears to be happening.</p>