[SVN 2488] Slaughter talents should describe axe requirement

[complexityQuantifier]

In the descriptions of the Slaughter talents (data/talents/cursed/slaughter.lua), it would be helpful if each talent's description noted that it requires an axe to use.

I bought up "Slash" on my first Cursed character, and then was disappointed that it didn't work with a sword. I know that the talent tree description for "cursed/slaughter" says "Your axe yearns for its next victim.", but it's easy to not read that. It's just one of those little interface difficulties that are important for new players.