LuaEntityPrototype::running_speed description is inaccurate

[SpeckledFleebeedoo]

The description of LuaEntityPrototype::running_speed says that it is "including effects from exoskeletons, tiles, stickers and shooting", which makes no sense on a generic EntityPrototype class, and a quick test confirms that it does in fact not change when exoskeletons are equipped. The description seems to be incorrectly copied from LuaControl::character_running_speed.

[Bilka]

Thanks for the note, fixed for the next doc release.