In the generated files for the declaration of a class (or package or module?) the "description" of the declaration is enclosed in a <section > as seen in this toy example:

<section class="description">
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="C.html" title="class in &lt;Unnamed&gt;">C</a></code></dd>
</dl>
<hr>
<pre>abstract abstract class <span class="typeNameLabel">B</span>
extends java.lang.Object</pre>
</section>

However, the HTML5 spec suggests that <section>s should normally have a heading within them:
https://www.w3.org/TR/html52/single-page.html#elementdef-section

The section element represents a generic section of a document or application. A section, in this context, is a thematic grouping of content. Each section should be identified, typically by including a heading (h1-h6 element) as a child of the section element.

While it is useful to group the content of a description, in this case, it would be more appropriate to use <div> instead of <section> because the content does not include a heading.

An alternative solution would be to put a heading in that section, but that would be a bigger change, including a arguably-gratuitous change to the visual content of each page.