title: YARD how to document @return type for a method that returns fixed-size array?
body: <p>I have the following method:</p>
  <pre class="lang-rb prettyprint-override"><code>def foo
    [true_or_false, some_integer]
  end
  </code></pre>
  <p>it always returns an array of 2 where 1st element is boolean and 2nd is integer.
  How to document it in YARD using <code>@return</code> meta tag?</p>
  <p>That's how it is later used:</p>
  <pre class="lang-rb prettyprint-override"><code>is_success, exit_code = foo
  </code></pre>
  <p>I've checked the <a href="https://www.rubydoc.info/gems/yard/file/docs/Tags.md#return" rel="nofollow noreferrer">official documentation on @return section</a> but it didn't help much.</p>