Deletion of HP 520

Comment: per elete the junk. This is unreferenced, barely three sentences long and the notable claims it does make are wrong anyway. The DeskJet is obviously notable, but the DJ+ and the DJ 500 were mere derivatives of this. By the time of the DJ 520 the technology was well established and the 520 itself did not advance this in any significant or notable manner
Stance: delete
Cited policy: Wikipedia:Disambiguation (WP:D)