Much clearer, but the first sentence still says "bed compensation should be tapered off over the specified height." I think what throws me is the word "height" - I think "range" would convey it better. One last suggestion and then I promise I'll shut-up and stop wasting your time! 
This command allows the bed compensation to linearly taper off over the range between Z=0 and Z=H, so that full bed compensation is applied at Z=0 and no bed compensation is applied when Z is at or above H. If H is zero or negative, tapering is disabled so compensation is performed throughout the entire print.
I used to manage a group of engineers who had to do a fair amount of technical writing. I'm pretty sure they hated me (at least when they were writing datasheets).