https://www.w3schools.com/tags/tag_source.asp
<source> tag is used to specify media resources for media elements like video, audio, etc.

Checkstyle mistakenly uses <source></source> to denote the code portions and bypass additional criterias for tags like <div class="wrapper"> for <pre></pre>

We should use genuine tags for denoting code portions like <code></code>, while directly transferring them to xdoc/meta data files