arrow

ARROW-13125: [R] Throw error when 2+ args passed to desc() in arrange()

This throws an error if the user passes two or more arguments to `desc()` in `arrange()`. Previously the second argument was silently ignored. The zero-arguments case is already handled.

Closes #10559 from ianmcook/ARROW-13125

Authored-by: Ian Cook <ianmcook@gmail.com>
Signed-off-by: Ian Cook <ianmcook@gmail.com>