Consider a documentation oriented license

[gregsymons]

Given that it will be pretty common for people to copy and paste the rendered text into their own documentation systems (Confluence, in my case), rather than using the source to build a site and publish that, the Apache license doesn't necessarily seem appropriate. You may want to consider a document oriented license like one of the Creative Commons licenses. It makes it clearer what to do for derivative works that are not based on the markdown source.