[Masteries] Does Windspeaker's Blessing (cunning tree) apply on all heals or just healing abilities?

"Your heals and shields are 10% stronger." Based on context, it seems to imply that only healing abilities are enhanced like Astral Blessing, Aria of Perseverance, and Imbue, and summoner spell Heal as well. I am assuming it doesn't work on **all** healing effects like Vladimir's Q or Mundo's Q?
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