I'm trying to keep each FAQ answering a simple single question. But sometimes two different questions are going to lead to the same answer. A reasonably knowledgeable user who knows the correct term might ask "How do I use $feature?". But someone who doesn't even know what the feature is called might ask "How do I make my journal do that thing where...?", and both of them basically want the same answer. So I'm occasionally going with the double title in order to gloss some jargon and help people who don't know the name of what they're looking for. But yes, one topic per FAQ is my golden rule.