Clear up confusing matched route docs

[phillipskevin]

In the Finding the matched route docs, clarify what map and set mean in:

Find all routes with all of their map properties set

Also, this is not totally correct:

If a route contains default values, these map properties must also be set to match the default value in order for the route to be matched:

This makes it sound like route('{page}',{page: "home"}) will not match a route like {page: "register"}.