Hey there. I know this is late, but i just ran into the same thing. and found a solution.
While, yes, a website with its documentation would be great, i would like to leave instructions for our level designers on how to use the systems i create wherever possible. Thus i would like to create a simple text asset and chuck it into the content browser.
Then i remembered, that a simple text asset was literally the sample for one of the first ue4 guides i read - creating your own text assets. Ill leave a link for anyone thats interested.