Vayne; A balance change

I will make this as little changes and brief as possible.

Silver Bolts (W): True damage changes to 30/45/60/75/90 plus 6/8/10/12/14% of the target's total bonus health [current, 20/30/40/50/60 plus 4/5/6/7/8% of the target's maximum health] most cases a damage nerf, but can be a small buff against high health tanks in the end game, on average about a damage equal

Final Hour (R): Stealth duration down to 0.75 second [current 1 second]