[Typo] Config Comments Lists Dire Slime Medium Spawn Chance Twice

[EnderofGames]

Just a typo as the Title says, the config prompts for chance of medium dire slime spawning twice, although the first instance is actually the chance for the large dire slime. Found in 1.12.2

Also the fact the config goes from small (regular) to large to medium is somewhat offputting, but that shouldn't be an actual problem.