They often just include generated module level type/function docs as in the `purescript-web-dom` one you linked to. Meanwhile the developer just wants a quick overview and some examples of querying the DOM in order to evaluate it.
I tried using PureScript last year but I was having dependency problems like crazy. Largely because everything was very alpha and dependency chains were unreliable.
It's good to see the community maturing, there's still some way to go first, which is excepted with any new language. I might try it out again this weekend as I'm a fan of Haskell.