Where is documentation for "aicontext.personalContext" setting?

(from default settings.json):

    // Personal context to inject into the completions and chat models.
    "aicontext.personalContext": "",

How is this intended to be used?
Is it the similar to the “Rules for AI” tab?
If so, does it override or work in tandem with said rules?
Does documentation exist somewhere?

Hmm, I don’t think that setting is doing anything. You should just use the “Rules For AI” textarea in the “More” tab.