Question to the preseason 2016 Masteries

Hi @ll, so I read many articles about the preseason changes and I am looking forward to see them online soon (hopefully tomorrow). But one question I have, that I never found an answer for, is: The Mastery "Sorcery" in the "Ferocity" tree. It says "x% increased Ability and Spell damage". But what is "Ability and Spell damage"? Can someone enlighten me, if for example Kha'Zix abilities are increased too (physical damage)?
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