We don't do RTFM here. We do have ways of showing that a question hasn't demonstrated research effort, but all answers are expected to be self-contained and up to our standards, regardless of the question.
If a question is an "egregiously sloppy, no-effort-expended post", you should downvote it. The same applies to answers—if your answer is a brief link elsewhere, it's not really much better than the type of question we want to discourage.
Remember, if a question is so obvious that it is a waste of time to answer, you can move on to more interesting questions. You're never obligated to answer a question, and it might be preferable to not answer at all rather than give a brief, link-only answer.
Sometimes, just quoting the relevant section would be enough to solve the problem. This takes minimal effort on the answerer's part, but does vastly improve the answer for future visitors.
Remember, you're not just answering for the OP (in fact, that's more a side-effect); you're trying to help everyone in future with the same question. That's why you should always try to give the best answer you can—so that future readers also benefit.