Update docs to use Move instead of Moved

[starwed]

This should address the misleading documentation mentioned here.

[matthijsgroen]

Trick with this (for me at least) was if a movement is heading south-east, and the entity has a collision only on the south side, to keep the motion eastward intact (gliding over the other entity). with reverting both axis, the entity gets 'stuck' when going south-east

[starwed]

That's true, but in terms of just updating this example I think the simpler collision resolution is fine.

e: Probably we should have a general doc section on collision management that explains these things.