Start deferring to the LaTeX docs for details. I'd like to move the

Start deferring to the LaTeX docs for details.  I'd like to move the
docstrings toward being a lot shorter, and telling the whole truth in
the manual instead.  This change is an example:  the manual has detailed
explanations of the option names now, so it's Bad to repeat them in
the docstring (two detailed descriptions are certain to get out of synch).
Just listing the names has memory-jogging benefits, though, so that's
still helpful in the docstring.