API C ItemUpgrade.GetItemUpgradePvpItemLevelDeltaValues

Needs summary.
 currentPvPItemLevel, upgradedPvPItemLevel = C_ItemUpgrade.GetItemUpgradePvpItemLevelDeltaValues(numUpgradeLevels)
==Arguments==
:;numUpgradeLevels:
==Returns==
:;currentPvPItemLevel:
:;upgradedPvPItemLevel:
==Patch changes==