resolve getter/setter references with different scopes before combining docs

[jcollins-g]

The new lookup code is going to skip over this problem much as the old one does, but it is still an issue. WRT comment reference resolution, each accessor in a GetterSetterCombo potentially has a different resolution grandparent (definingLibrary). This means that comment references in each piece of a Field or TopLevelVariable should be resolved with that context in mind. Currently the docs just get squished together meaning one accessor or the other could resolve with the wrong scope.