more intradoc links
The core data types for defining 2D and 3D integer lattices.
-- `PointN`: an N-dimensional point, most importantly `Point2i` and `Point3i`
-- `ExtentN`: an N-dimensional extent, most importantly `Extent2i` and `Extent3i`
+- [`PointN`]: an N-dimensional point, most importantly [`Point2i`] and [`Point3i`]
+- [`ExtentN`]: an N-dimensional extent, most importantly [`Extent2i`] and [`Extent3i`]
