Links for types from other modules

If I `@returns {boolean}` I get a nice link to the documentation for booleans.

However, if I `@returns {BigInteger}` I don't get a link because `documentation` doesn't know what it is (though it might be able to infer it by seeing that there's a BigInteger variable that's `require`d from a node module and use the homepage from its `package.json` for the URL)...