Which ones specifically? I had to keep the micro-explanations very short so they only give a very very basic over-view, but the full page explanations should be more than suitable as they're a combination of the Wikipedia explanation and the official IETF explanation (from the RFCs).
Well, for 304 the explaination is "this and all future requests should redirect to given URI", which is just wrong. Simply "Not modified" would be better.
