bug#4199: 23.1; Documentation of `set-window-start' and `set-window-hscroll'

[Eli Barzilay]

1. The documentation string for `set-window-start' says

     window defaults to the selected window.

   but the `window' argument is not optional -- so it should say that
   when it is nil the selected window is used.

2. `set-window-hscroll' doesn't even mention that the `window'
   argument can be nil.

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!