title: NestJS - How do I expose param in Swagger
body: <p>I am using NestJs. I have this controller:</p>
  <pre><code>@Get(':id')
    @ApiOperation({ summary: 'Get action by id' }) 
    findById(@Param('id') id: string, @Query() query?: SelectQuery &amp; PopulateQuery): Promise&lt;Action&gt; {
      return this.actionService.findById(id, query);
    }
  </code></pre>
  <p>When I open the page in Swagger, it says there are no parameters available.</p>
  <p>In the Swagger, how can I make the param 'id' as an input box, so I can use it in the Swagger (browser)?</p>
  <p>Thank you.</p>