geometry: fix doc

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
geometry: fix constructors for right Z axis

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
geometry: fix nitunit of contains

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>