[introspection] Add missing annotations to GDataFeed
[introspection] Add missing annotations to GDataFeed

Pecisk/libgdata,Pecisk/libgdata-gtasks,Pecisk/libgdata,pwithnall/libgdata,Distrotech/libgdata,Distrotech/libgdata,pwithnall/libgdata,Pecisk/libgdata-gtasks,Pecisk/libgdata,Distrotech/libgdata,Pecisk/libgdata-gtasks,GNOME/libgdata