add some documentation for JNWCollectionViewData (private)
add some documentation for JNWCollectionViewData (private)

konstantinpavlikhin/JNWCollectionView,Spark-Xl/JNWCollectionView,regexident/JNWCollectionView,jwilling/JNWCollectionView,kettch/JNWCollectionView,chriseidhof/JNWCollectionView,hachidorii/JNWCollectionView,Deadpikle/JNWCollectionView,danielmartinprieto/JNWCollectionView