bar number direction doumentation inconsistent

[Paul Scott]

The 2.8.0 documentation:
   
http://lilypond.org/doc/v2.8/Documentation/user/lilypond-internals.html#BarNumber
   says

|direction| (direction):
   |1|

   Up or down, left or right?

The new reader wouldn't know that 1 was UP and -1 was DOWN and 0 was in 
the middle.  Also LEFT and RIGHT are the same as DOWN and UP, respectively.

I was hoping LEFT might help with the current default position bug.

Paul Scott