Each FAQ should be cross-referenced from a relevant page in one of the guides. (If a relevant page in the guide is missing, then we probably need to create one!) Each question should be a new page. Answers should be concise and focused. If an answer seems long, or seems like it could relate to more than one section, then the question might be addressing more than one concern.
FAQs can also be "mini-HOWTOs". As long as the question and answer are focused on a single concern, length is not an issue.
To suggest a change or a correction to any part of the documentation, log in and leave a comment on the appropriate page. We are always looking for help with the documentation!