Hey NJ,

I'm going to revert these changes as they are incorrect. It's not really your fault, as iD (the editor that you used) doesn't make it obvious that these were already fairways. They are part of a "multipolygon" relation where the fairway and green are paired together and everything inside the fairway EXCEPT the green defines the fairway. 

In the future, if you see what looks like a fairway and iD claims it is a "Line", check first to see if it is part of a relation.

I'm going to try to create a wiki page to better describe this. This is what I have so far: https://wiki.openstreetmap.org/wiki/ID_understanding_golf_course_relations