[silvester23]

These are playable races and character classes from Warcraft III (and the expansion The Frozen Throne).

Most of these probably also appear in World of Warcraft, though I cannot say for sure.

As to why this file is in the top directory of the repo, your guess is as good as mine.

[brenniemac]

I think more specifically this is referring to heroes from Dota (which of course links back to Warcraft III as you said)

[Zekio]

nah, they are just the default heroes that exist in Warcraft 3 Reign of Chaos and Frozen Throne, which is easily discerned by the names and the fact the races are listed as titles and the Neutral heroes doesn't have a race mentioned in English

Also there are a lot more heroes in the Dota map for Warcraft 3 than on that short list