Well, technically both dwarfs and dwarves are a plural of dwarf with dwarfs being the more common one. But I guess, for this purpose, the only plural ever used for them in the game is dwarves. I really don’t see why anyone confuse that with Blizzard blatantly showing which plural they prefer as evident by the link you provided. And I think we can all agree, dwarves sounds cooler than dwarfs. 😀
And Cynra, ya it seems that spell checkers are fickle when it comes to plurals of words. Luckily, I have one that allows me to add new words to the dictionary, making all those red underlines go away, especially when I type about stuff like this.