Add comments about incompleteness of SLNURIFilter.
Add comments about incompleteness of SLNURIFilter.

iOSCowboy/stronglink,nkatsaros/stronglink,iOSCowboy/stronglink,btrask/stronglink,btrask/stronglink,Lacra17/stronglink,guiquanz/stronglink,feld/stronglink,shaunstanislaus/stronglink,feld/stronglink,feld/stronglink,nkatsaros/stronglink,iOSCowboy/stronglink,yamingd/stronglink,Ryezhang/stronglink,rmoorman/stronglink,guiquanz/stronglink,Ryezhang/stronglink,yamingd/stronglink,btrask/stronglink,shaunstanislaus/stronglink,Ryezhang/stronglink,rmoorman/stronglink,yamingd/stronglink,Lacra17/stronglink,nkatsaros/stronglink,rmoorman/stronglink,Lacra17/stronglink,guiquanz/stronglink,shaunstanislaus/stronglink,btrask/stronglink