random nits

* disable scalariform's auto-rewriting of dangling parends. lmk if you guys feel strongly that this should never be done (vs. were just inheriting a scalariform default), I like the option to use a dangling close-parend in some cases.
* wrap some long lines and update some comments
@fnothaft actually, is it always `/1` `/2` here? I've never seen the `_1`/`_2` version in the wild, but that's not saying much