More nuance on newlines around argument vectors.

The form currently marked “bad” occurs frequently in the implementation of Clojure itself and many popular libraries.  As it occurs in practice, is more compact, and doesn’t appear to introduce any readability problems, I see no reason to advise against it.

The suggested optional new line elision on the other hand leads to more diff churn when adding docstrings and increases the odds of the docstring being added incorrectly.  The form occurs somewhat frequently in practice and thus should be documented as acceptable, but I believe these caveats should be noted.
Seems to me `good` and `acceptable` should be the other way around if we decide to go through with this.