Documentation example for Utilities confusing

[ArneMeier]

I might misunderstand something, but the example for, e.g., leftsibling in the documentation of anytree/util/__init__.py states two things

1. It suggest only from anytree import Node
2. To directly call, e.g., leftsibling(dan)

For me, both did not work out. I had to

1. Import the method via from anytree.util import leftsibling
2. Do a, e.g., print(leftsibling(joe)) in order to get the desired output.