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
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.