[Dillo-dev] scroll_step description

There's a new "scroll_step" option in the example configuration file for 3.1.0-rc1. The comment "Mouse wheel scroll step in pixels" suggests that this only affects the mouse wheel, but it also changes the distance the page moves when the arrow keys are pressed and the overlap of previous page content that's left when you press Page Up/Down. I think that's a little confusing, especially as the value has changed since the default behaviour in 3.0.5 (the old value seems to have been about 25).