Think it would be interesting to include something on what the community expect from "Ask HN" and "Show HN" posts — thought I'd double-check the guidelines/FAQ

Think it would be interesting to include something on what the community expect from "Ask HN" and "Show HN" posts — thought I'd double-check the guidelines/FAQ before posting one before & realised they're not mentioned there at all. Also, would be good to call out what flavour of formatting is supported by comments.