Review/reformat all examples to follow NL suggestions

[mikedld]

There're examples that don't follow the suggestions outlined in the guidelines themselves, specifically NL.16 but potentially other as well, which makes it awkward when pointing people to read a particular rule — they read an example and start following the [wrong?] style without reading through all the guidelines — since nobody likes to read that much text, and NL is at the very end. It's aggravated by the fact that there's currently no check (that I know of) implemented for NL.16 specifically in static analysis tools like clang-format/clang-tidy.