Name the action, not the terror
'Generated content may be wrong' is true and useless. The useful disclaimer continues: 'check the cited sources, run the snippet, read the diff before trusting it.' An action a user can take beats an anxiety they cannot. This site's note does exactly that — three concrete checks, zero fear-mongering.
One note, dismissible, repeated never
A disclaimer that appears on every answer at full volume is noise; a user who has seen it twice starts skipping it. The calm version appears once, says the checks, and can be dismissed — the dismissal is the proof the interface trusts its user. And the note is voice: a product that apologises for every answer is a product that does not stand behind its own work.