Well, yeah, several of them seem to favor smarter characters, but I just assumed the helpfile was referring to intelligence or else it would have mentioned wisdom directly.

Flow of Shadows, Incarnadine Wave and Surrounding the Sunrise all mention elves directly, but don't explicitly mention intelligence.

One With Shadows is more explicit: "clever as they were strong". "Clever", though, doesn't suggest wisdom. Same for Place of the Raging River: "an intensity of thought that few ever master". Also Ward of Blades: "devoted their eye and mind".

Now, Calming the Tempest, Forsaken Thoughts and Fortress of the Spirit all seem like they might key off wisdom, since they mention things like "meditation", "willpower" and "monastic training". All priestly sounding things. But it's not as explicit as the intelligence-based ones above, so who can know for sure?