A dutiful crime documentary that raises few hackles, “Operation Varsity Blues: The College Admissions Scandal,” doesn’t waste breath on moralistic huffing and puffing about what a certain group of rich parents did to get their children into exclusive colleges. It also, delightfully, expends precious little screen time on the celebrities like Felicity Huffman and Lori Laughlin, whose faces and names featured in nearly all news stories about this story when it broke in early 2019. Given the tabloid gotcha giddiness that characterized most of that coverage, what director Chris Smith does is almost radical: Sticking mostly to the crime itself, the accused ringleader behind it, Rick Singer, and the systemic corruption he exploited.