I could edit a book. I used to write manuals for my department. Since I was writing them, I decided to pursue a technical writing certificate. I have always liked grammar. I'm with quilt9226 in noticing that it appears most "literary" sources have done away with editors. Not just newspapers, but online content and books. I used to find errors in self-published books, but now I see them in mainstream books as well. It is annoying.
I found out a long time ago that Spellcheck is not your friend, since it only checks spelling and not grammar. Therefore, it will allow the wrong word to be used just because it is spelled correctly (their vs there). Spellcheck doesn't check grammatical correctness either. As it is named, it only checks spelling.