Thanks for asking me, but I'm not sure how I can help.
This message is not part of MediaWiki, but the Configure extension. I didn't create this message, nor maintain or use the Configure extension.
This message is related to the setting "$wgResourceLoaderDebug" in MediaWiki core, but it is not the documentation of that setting itself, this is the label for changing that setting in the Configure extension.
The documentation about the setting itself on MediaWiki.org and in the MediaWiki core source code looks fine.