If the answer to a question is patently in the official, easy to find, obvious documentation, the question has little value because:
- it is a basic question that 99% of visitors would already know
- the answer is already published
- any answer given would not stay as current as official documentation
So it should be closed, but the existing close reasons don't cover it. The most reasonable close reason would be a custom "...because the answer is available in official on-line documentation".
However this situation happens more often (in my experience) than some of the other pre-canned reasons.
What about adding a "the answer is available in official on-line documentation" to the menu?
Yes, I know it's already cluttered. I'd vote for removing some of the "other site" shortcuts and move them into the "other site" menu (one more click, big deal), leaving the front off-topic menu for custom reasons.
The close vote would require a link to said documentation. Like duplicates, 4 other people would need to agree to the link for the question to be closed. The post would be decorated with something like:
This question has already has an answer in online documentation here: http://example.com/docs/bar.html
