ServerWorld#spawnParticles suggests that setting count to 0 does something it doesn't

[Burrnr]

The ServerWorld#spawnParticles method's docstring claims that

If count is 0, a single particle will be spawned with its velocity being deltaX, deltaY, deltaZ multiplied by speed.

In reality, setting count to zero spawns a single particle unaffected by having its position being randomized by deltaX, deltaY, deltaZ multiplied by speed.

This also makes the parameter speed's name misleading, when a name like offset would be more representative of the actual use.

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