title: "Request body" doesn't appears on Swagger UI
body: <p>I'm trying to do a test with a <strong>POST</strong> request on my Swagger Documentation, but I'm having the following trouble:</p>
  
  <p>On Swagger Editor I can test it normally, but on Swagger UI the Request body field doesn't appears, so I can't put my email and password to test the request.</p>
  
  <p>Here you can see the Request body field with data examples ready to be edited:<br>
  <a href="https://i.stack.imgur.com/ImMqt.png" rel="nofollow noreferrer">Swagger Editor Example</a></p>
  
  <p>And here you can see that Swagger UI doesn't shows it:<br>
  <a href="https://i.stack.imgur.com/G6NpK.png" rel="nofollow noreferrer">Swagger UI Example</a></p>
  
  <p>Note: I've generated a <strong>nodejs-server</strong>.</p>
  
  <p>My <code>.yaml</code> code:</p>
  
  <pre><code>openapi: '3.0.1'
  
  info:
    version: 1.0.0
    title: Test
    description: Test openapi.
  
  servers:
    - url: http://localhost:3005
  
  paths:
    /login:
      post:
        summary: Login
        requestBody:
          required: true
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/login'
        responses:
          200:
            description: Test
  
  components:
    schemas:
      login:
        type: object
        properties:
          email:
            type: string
            example: example@example.com.br
          password:
            type: string
            format: password
            example: example123
          expires:
            type: integer
            example: 86400
        required:
         - email
         - password
  </code></pre>