there is no dot on the gear if it was drawn right that dot would be a hidden line. But there is not enough room to properly draw it right. What the are explaining is the marks on the crank and the engine block.
below is the marks on the crank shaft gear that meshes with the clutch basket (Primary Drive) I circled where the marks are. If this is not good enough I will drag a crankshaft out for pictures or go see what the view of the 05 engine I have in the barn because the front is open
now on the actual engine case there is also two markings one at 6 and one at 12.
This picture is through a scope. Its what you will be lining up thru the inspection port in the front cover or if you have the cover off you can see it directly. Mine had a blower cover on it so no inspection port like the normal cover but you will get the idea.
hope this helps