[GAMEPLAY] Kalista E upgrade tooltip has incorrect values

Three minor bugs to report:

• First, the actual slow values for Rend are 25 / 30 / 35 / 40 / 45%, but the upgrade tooltip instead shows the progression as 33 / 37.5 / 41.67 / 45.83 / 50% slow.
• Second, for some bizarre reason, the cooldown of the ability displays the BASE cooldown on its upgrade tooltip instead of its cooldown after applying CDR, like each other ability in the game does.
• Third, by some massive oversight, the regular tooltip (not the upgrade tooltip) for the ability makes no mention of the STACKING mechanic that gives Kalista all her damage. It does not say "do ### damage for each spear" it says "do ### damage". Just so everyone in the comments knows, according to the LOL wiki, the first spear does 20 / 30 / 40 / 50 / 60 (+ 60% AD) damage, and each spear after the first does 10 / 14 / 19 / 25 / 32 (+ 20 / 22.5 / 25 / 27.5 / 30% AD), about half damage.

Edit: bug #4 discovered, before ranking up Rend for the first time, its cooldown is listed as 15.5s, but as soon as you rank it up, its cooldown becomes 14.0 seconds like it's supposed to.