Elaborated on the boilerplate

The mental leap required in understanding that there was a returned
function that took `submittedUsers` is a hard step. I think that adding
the returned function, with the parameter `submittedUsers` makes the
jump a little more manageable.
Merge pull request #29 from lorcan/basic_every_some_boilerplate

Elaborated on the boilerplate in the basic_every_some problem